diff --git a/server/mail.c b/server/mail.c
index afb7ab4..7ddb824 100644
--- a/server/mail.c
+++ b/server/mail.c
@@ -436,9 +436,8 @@ check_mbox(Mailbox *mbox)
 		mbox->mail_count = mbox->old_mail_count = mbox->new_mail_count = 0;
 		mbox->last_mtime = 0;
 		mbox->last_size = 0;
-		if (_GK.debug_level & DEBUG_MAIL)
-			printf("check_mbox can't stat(%s): %s\n", mbox->path,
-						g_strerror(errno));
+		gkrellm_debug(DEBUG_MAIL, "check_mbox can't stat(%s): %s\n",
+			mbox->path, g_strerror(errno));
 		return FALSE;
 		}
 
@@ -451,9 +450,8 @@ check_mbox(Mailbox *mbox)
 		{
 		if ((f = fopen(mbox->path, "r")) == NULL)
 			{
-			if (_GK.debug_level & DEBUG_MAIL)
-				printf("check_mbox can't fopen(%s): %s\n", mbox->path,
-							g_strerror(errno));
+			gkrellm_debug(DEBUG_MAIL, "check_mbox can't fopen(%s): %s\n",
+				mbox->path, g_strerror(errno));
 			return FALSE;
 			}
 		mbox->mail_count = 0;
diff --git a/server/monitor.c b/server/monitor.c
index 4ad3ecf..9cd270c 100644
--- a/server/monitor.c
+++ b/server/monitor.c
@@ -97,7 +97,7 @@ gkrellmd_serve_data(GkrellmdMonitor *mon, gchar *line)
 			}
 		else
 			{
-			printf("gkrellmd: %s forgot to gkrellmd_set_serve_name()\n",
+			g_warning("gkrellmd: %s forgot to gkrellmd_set_serve_name()\n",
 					mon->name);
 			return;
 			}
@@ -201,7 +201,7 @@ serve_cpu_data(GkrellmdMonitor *mon, gboolean first_serve)
 	for (list = cpu_list; list; list = list->next)
 		{
 		cpu = (CpuData *) list->data;
-		sprintf(buf, "%d %lu %lu %lu %lu\n", cpu->instance,
+		snprintf(buf, sizeof(buf), "%d %lu %lu %lu %lu\n", cpu->instance,
 				cpu->user, cpu->nice, cpu->sys, cpu->idle);
 		gkrellmd_serve_data(mon, buf);
 		}
@@ -471,7 +471,7 @@ gkrellm_disk_assign_data_nth(gint n, guint64 rb, guint64 wb, gboolean virtual)
 		disk = (DiskData *) g_list_nth_data(disk_list, n);
 	else
 		{
-		sprintf(name, "%s%c", _("Disk"), 'A' + n);
+		snprintf(name, sizeof(name), "%s%c", _("Disk"), 'A' + n);
 		disk = add_disk(name, n, 0, 0);
 		}
 	disk_assign_data(disk, rb, wb, virtual);
@@ -741,7 +741,7 @@ serve_inet_data(GkrellmdMonitor *mon, gboolean first_serve)
 			   )
 				{
 				cp = inet_ntoa(tcp->remote_addr);
-				sprintf(buf, "+0 %x %s:%x\n",
+				snprintf(buf, sizeof(buf), "+0 %x %s:%x\n",
 							tcp->local_port, cp, tcp->remote_port);
 				}
 #if defined(INET6) && defined(HAVE_GETADDRINFO)
@@ -783,7 +783,7 @@ serve_inet_data(GkrellmdMonitor *mon, gboolean first_serve)
 			if (tcp->family == AF_INET)
 				{
 				cp = inet_ntoa(tcp->remote_addr);
-				sprintf(buf, "-0 %x %s:%x\n",
+				snprintf(buf, sizeof(buf), "-0 %x %s:%x\n",
 							tcp->local_port, cp, tcp->remote_port);
 				}
 #if defined(INET6) && defined(HAVE_GETADDRINFO)
@@ -1089,7 +1089,7 @@ serve_net_data(GkrellmdMonitor *mon, gboolean first_serve)
 		net = (NetData *) list->data;
 		if (net->changed || first_serve)
 			{
-			sprintf(buf, "%s %lu %lu\n", net->name, net->rx, net->tx);
+			snprintf(buf, sizeof(buf), "%s %lu %lu\n", net->name, net->rx, net->tx);
 			gkrellmd_serve_data(mon, buf);
 			}
 		}
@@ -1106,7 +1106,7 @@ serve_net_data(GkrellmdMonitor *mon, gboolean first_serve)
 			fake_up_event = (first_serve && net->up);
 			if (net->up_event || net->down_event || fake_up_event)
 				{
-				sprintf(buf, "%s %d\n", net->name,
+				snprintf(buf, sizeof(buf), "%s %d\n", net->name,
 						fake_up_event ? TRUE : net->up_event);
 				gkrellmd_serve_data(mon, buf);
 				}
@@ -1120,7 +1120,7 @@ serve_net_data(GkrellmdMonitor *mon, gboolean first_serve)
 		if (net_timer->timed_changed || first_serve)
 			{
 			gkrellmd_set_serve_name(mon, "net_timer");
-			sprintf(buf, "%s %d\n", net_timer->name, (gint)net_timer->up_time);
+			snprintf(buf, sizeof(buf), "%s %d\n", net_timer->name, (gint)net_timer->up_time);
 			gkrellmd_serve_data(mon, buf);
 			}
 		}
@@ -1940,7 +1940,7 @@ serve_sensors_data(GkrellmdMonitor *mon, gboolean first_serve)
 			continue;
 		if (sr->changed || first_serve)
 			{
-			sprintf(buf, "%d \"%s\" %d %d %d %.2f\n",
+			snprintf(buf, sizeof(buf), "%d \"%s\" %d %d %d %.2f\n",
 					sr->type, sr->id_name,
 					sr->id, sr->iodev, sr->inter, sr->raw_value);
 			gkrellmd_serve_data(mon, buf);
@@ -1965,12 +1965,12 @@ serve_sensors_setup(GkrellmdMonitor *mon)
 		if (s->group == SENSOR_GROUP_DISK && !sensor_disk_ok)
 			continue;
 		if (sensor_disk_ok)
-			sprintf(buf, "%d \"%s\" %d %d %d %.4f %.4f \"%s\" \"%s\" %d\n",
+			snprintf(buf, sizeof(buf), "%d \"%s\" %d %d %d %.4f %.4f \"%s\" \"%s\" %d\n",
 					s->type, s->id_name,
 					s->id, s->iodev, s->inter,
 					s->factor, s->offset, s->vref, s->default_label, s->group);
 		else
-			sprintf(buf, "%d \"%s\" %d %d %d %.4f %.4f \"%s\" \"%s\"\n",
+			snprintf(buf, sizeof(buf), "%d \"%s\" %d %d %d %.4f %.4f \"%s\" \"%s\"\n",
 					s->type, s->id_name,
 					s->id, s->iodev, s->inter,
 					s->factor, s->offset, s->vref, s->default_label);
@@ -2057,7 +2057,7 @@ send_time(GkrellmdClient *client)
 	gchar		buf[128];
 
 	t = &gkrellmd_current_tm;
-	sprintf(buf, "<time>\n%d %d %d %d %d %d %d %d %d\n",
+	snprintf(buf, sizeof(buf), "<time>\n%d %d %d %d %d %d %d %d %d\n",
 		t->tm_sec, t->tm_min, t->tm_hour,
 		t->tm_mday, t->tm_mon, t->tm_year,
 		t->tm_wday, t->tm_yday, t->tm_isdst);
@@ -2111,7 +2111,7 @@ gkrellmd_load_monitors(void)
 	if (_GK.list_plugins)
 		exit(0);
 	if (_GK.log_plugins)
-		printf("%s\n", plugin_install_log ? plugin_install_log :
+		g_message("%s\n", plugin_install_log ? plugin_install_log :
 				_("No plugins found\n"));
 	for (  ; list; list = list->next)
 		{
@@ -2201,7 +2201,7 @@ gkrellmd_update_monitors(void)
 			send_time(client);
 		else if (GK.second_tick)
 			{
-			sprintf(buf, "<.%d>\n", gkrellmd_current_tm.tm_sec);
+			snprintf(buf, sizeof(buf), "<.%d>\n", gkrellmd_current_tm.tm_sec);
 			gkrellmd_send_to_client(client, buf);
 			}
 
@@ -2241,7 +2241,7 @@ gkrellmd_serve_setup(GkrellmdClient *client)
 	g_free(s);
 
 	lc = localeconv();
-	sprintf(buf, "%c\n", *lc->decimal_point);
+	snprintf(buf, sizeof(buf), "%c\n", *lc->decimal_point);
 	s = g_strconcat("<decimal_point>\n", buf, "\n", NULL);
 	gkrellmd_send_to_client(client, s);
 	g_free(s);
@@ -2269,16 +2269,16 @@ gkrellmd_serve_setup(GkrellmdClient *client)
 	for (list = gkrellmd_monitor_list; list; list = list->next)
 		{
 		mon = (GkrellmdMonitor *) list->data;
-		sprintf(buf, "%s\n", mon->name);
+		snprintf(buf, sizeof(buf), "%s\n", mon->name);
 		gkrellmd_send_to_client(client, buf);
 		}
 
-	sprintf(buf, "%d\n", _GK.io_timeout);
+	snprintf(buf, sizeof(buf), "%d\n", _GK.io_timeout);
 	s = g_strconcat("<io_timeout>\n", buf, "\n", NULL);
 	gkrellmd_send_to_client(client, s);
 	g_free(s);
 
-	sprintf(buf, "%d\n", _GK.reconnect_timeout);
+	snprintf(buf, sizeof(buf), "%d\n", _GK.reconnect_timeout);
 	s = g_strconcat("<reconnect_timeout>\n", buf, "\n", NULL);
 	gkrellmd_send_to_client(client, s);
 	g_free(s);
diff --git a/server/plugins.c b/server/plugins.c
index c884184..df61547 100644
--- a/server/plugins.c
+++ b/server/plugins.c
@@ -220,7 +220,8 @@ gkrellmd_plugin_scan(gchar *path)
 			}
 		if (_GK.list_plugins)
 			{
-			printf("%s    (%s)\n", name, path);
+			// TODO: list plugins support on win32
+			g_message("%s    (%s)\n", name, path);
 			continue;
 			}
 		for (list = plugin_list; list; list = list->next)
diff --git a/server/sysdeps-unix.c b/server/sysdeps-unix.c
index cfba58a..04bfc25 100644
--- a/server/sysdeps-unix.c
+++ b/server/sysdeps-unix.c
@@ -173,10 +173,9 @@ gkrellm_connect_to(gchar *server, gint server_port)
 		if ((fd = socket(res->ai_family, res->ai_socktype,
 				res->ai_protocol)) < 0)
 			continue;
-		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("\t[gkrellm_connect_to: (%d,%d,%d) %s:%d]\n",
-			       res->ai_family, res->ai_socktype,
-			       res->ai_protocol, server, server_port);
+		gkrellm_debug(DEBUG_SENSORS,
+			"\t[gkrellm_connect_to: (%d,%d,%d) %s:%d]\n", res->ai_family,
+			res->ai_socktype, res->ai_protocol, server, server_port);
 		if (connect(fd, res->ai_addr, res->ai_addrlen) >= 0)
 			break;
 #ifdef WIN32
@@ -188,8 +187,8 @@ gkrellm_connect_to(gchar *server, gint server_port)
 		}
 	freeaddrinfo(res0);
 #else
-	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("\t[gkrellm_connect_to: %s:%d]\n", server, server_port);
+	gkrellm_debug(DEBUG_SENSORS, "\t[gkrellm_connect_to: %s:%d]\n", server,
+		server_port);
 	addr = gethostbyname(server);
 	if (addr)
 		{
diff --git a/src/chart.c b/src/chart.c
index 779ae79..c63d7f3 100644
--- a/src/chart.c
+++ b/src/chart.c
@@ -1019,9 +1019,9 @@ gkrellm_draw_chart_text(GkrellmChart *cp, gint style_id, gchar *str)
 
 	if (_GK.debug_level & DEBUG_CHART_TEXT)
 		{
-		printf("\n");
+		g_debug("\n");
 		if (!cp->text_format_reuse)
-			printf("draw_chart_text: [%s]\n", str);
+			g_debug("draw_chart_text: [%s]\n", str);
 		}
 
 	if (   !cp->text_format_reuse
@@ -1171,7 +1171,7 @@ gkrellm_draw_chart_text(GkrellmChart *cp, gint style_id, gchar *str)
 
 				strncpy(buf, s, text_length);
 				buf[text_length] = '\0';
-				printf("draw_chart_text: [%s] ", buf);
+				g_debug("draw_chart_text: [%s] ", buf);
 				}
 			
 			offset = cp->baseline_ref - tr->baseline;	/* align baselines */
@@ -1183,7 +1183,7 @@ gkrellm_draw_chart_text(GkrellmChart *cp, gint style_id, gchar *str)
 				if (!tr->cache_valid)
 					{
 					if (_GK.debug_level & DEBUG_CHART_TEXT)
-						printf("pango ");
+						g_debug("pango ");
 					gdk_draw_drawable(cp->bg_text_pixmap, _GK.draw1_GC,
 							cp->bg_pixmap,
 							x - 1, y + tr->y_ink + offset - 1,
@@ -1193,7 +1193,7 @@ gkrellm_draw_chart_text(GkrellmChart *cp, gint style_id, gchar *str)
 							text_length);
 					}
 				if (_GK.debug_level & DEBUG_CHART_TEXT)
-					printf("x=%d y=%d w=%d h=%d\n",
+					g_debug("x=%d y=%d w=%d h=%d\n",
 							x - 1, y + tr->y_ink + offset - 1,
 							tr->w + shadow + 2, tr->h + shadow + 1);
 				gdk_draw_drawable(cp->pixmap, _GK.draw1_GC, cp->bg_text_pixmap,
@@ -1983,7 +1983,7 @@ gkrellm_125_sequence(gint value, gboolean use125,
 		{
 		for (i = 0; i < table_size; ++i)
 			{
-/*printf("  mapping[%d] value=%d table=%d\n", i, value, table[i]); */
+/*g_debug("  mapping[%d] value=%d table=%d\n", i, value, table[i]); */
 			if (value == table[i])
 				return table[i];
 			else if (value == table[i] - 1)
@@ -2742,20 +2742,20 @@ debug_dump_chart_list()
 	GkrellmPanel	*p;
 	GkrellmChartdata *cd;
 
-	printf("\n");
+	g_debug("\n");
 	for (list = gkrellm_get_chart_list(); list; list = list->next)
 		{
 		cp = (GkrellmChart *) list->data;
 		p = cp->panel;
 		if (p && p->label && p->label->string)
-			printf("%s [%d]: ", p->label->string, cp->style_id);
+			g_debug("%s [%d]: ", p->label->string, cp->style_id);
 		else
-			printf("(null) [%d]: ", cp->style_id);
+			g_debug("(null) [%d]: ", cp->style_id);
 		for (cdlist = cp->cd_list; cdlist; cdlist = cdlist->next)
 			{
 			cd = (GkrellmChartdata *) cdlist->data;
-			printf("%s %p->data ", cd->label, cd->data);
+			g_debug("%s %p->data ", cd->label, cd->data);
 			}
-		printf("\n");
+		g_debug("\n");
 		}
 	}
diff --git a/src/clock.c b/src/clock.c
index 18064ea..e332249 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -209,7 +209,7 @@ strftime_format(gchar *format, gchar *alt_color)
 	g_free (locale_format);
 	format_alt_color(buf1, buf2, sizeof(buf2), alt_color);
 
-// printf("%s\n", buf2);
+// g_debug("%s\n", buf2);
 
 	return g_locale_to_utf8 (buf2, -1, NULL, NULL, NULL);
 	}
diff --git a/src/config.c b/src/config.c
index 9b130fd..1f0b09f 100644
--- a/src/config.c
+++ b/src/config.c
@@ -567,7 +567,7 @@ assign_custom_style(gchar *debug_name, GList *style_list, gint index,
 		custom_style =
 				(GkrellmStyle *) g_list_nth_data(_GK.custom_style_list, i);
 
-//printf("assign_custom_style(%s, %s, %d, %s) %d\n",
+//g_debug("assign_custom_style(%s, %s, %d, %s) %d\n",
 //debug_name, custom_name, entry_flag, arg, i);
 	assign_style_entry(custom_style, arg, entry_flag);
 	set_themed(custom_style, entry_flag);
diff --git a/src/deprecated.c b/src/deprecated.c
index 635764f..16bb9c5 100644
--- a/src/deprecated.c
+++ b/src/deprecated.c
@@ -100,14 +100,14 @@ gdk_string_extents(void *font_desc, const char *string,
 int
 setuid(uid_t u)
 	{
-//	printf("setuid() intercepted\n");
+//	g_debug("setuid() intercepted\n");
 	return 0;
 	}
 
 int
 setreuid(uid_t r, uid_t e)
 	{
-//	printf("setreuid() intercepted\n");
+//	g_debug("setreuid() intercepted\n");
 	return 0;
 	}
 
diff --git a/src/disk.c b/src/disk.c
index c41942a..6713ecf 100644
--- a/src/disk.c
+++ b/src/disk.c
@@ -305,8 +305,8 @@ gkrellm_disk_assign_data_nth(gint n, guint64 rb, guint64 wb, gboolean virtual)
 		disk = (DiskMon *) g_list_nth_data(disk_mon_list, n + 1);
 	else
 		{
-		sprintf(name, "%s%c", "Disk", 'A' + n);
-		sprintf(label, "%s%c", _("Disk"), 'A' + n);
+		snprintf(name, sizeof(name), "%s%c", "Disk", 'A' + n);
+		snprintf(label, sizeof(label), "%s%c", _("Disk"), 'A' + n);
 		disk = add_disk(name, label, 0, 0, n);
 		}
 	disk_assign_data(disk, rb, wb, virtual);
@@ -1250,7 +1250,7 @@ cb_tree_selection_changed(GtkTreeSelection *selection, gpointer data)
 	path = gtk_tree_model_get_path(model, &iter);
 	indices = gtk_tree_path_get_indices(path);
 	depth = gtk_tree_path_get_depth(path);
-// printf("selection: indices=[%d,%d]:%d, path=%s\n",
+// g_debug("selection: indices=[%d,%d]:%d, path=%s\n",
 //          indices[0], indices[1], gtk_tree_path_get_depth(path),
 //          gtk_tree_path_to_string(path));
 	change_row_reference(model, path);
diff --git a/src/fs.c b/src/fs.c
index 2193b7a..4d9b5bd 100644
--- a/src/fs.c
+++ b/src/fs.c
@@ -754,9 +754,7 @@ fs_update(void)
 
 	if (!force_fs_check && (!GK.second_tick || (!fs_check && !nfs_check)))
 		return;
-#if 0
-printf("fs update %d nfs %d force %d\n", fs_check, nfs_check, force_fs_check);
-#endif
+//g_debug("fs update %d nfs %d force %d\n", fs_check, nfs_check, force_fs_check);
 
 	refresh_mounts_list();
 
@@ -1849,7 +1847,7 @@ cb_tree_selection_changed(GtkTreeSelection *selection, gpointer data)
 	indices = gtk_tree_path_get_indices(path);
 	secondary = indices[0];
 	depth = gtk_tree_path_get_depth(path);
-// printf("selection: indices=[%d,%d]:%d, path=%s\n",
+// g_debug("selection: indices=[%d,%d]:%d, path=%s\n",
 //			indices[0], indices[1], gtk_tree_path_get_depth(path),
 //			gtk_tree_path_to_string(path));
 	change_row_reference(model, path);
@@ -2208,7 +2206,7 @@ row_drop_possible(GtkTreeDragDest *drag_dest, GtkTreePath *path,
 		return FALSE;
 	src_path = gtk_tree_row_reference_get_path(row_reference);
 	indices = gtk_tree_path_get_indices(path);
-//	printf("drop path: indices=[%d,%d]:%d, path=%s\n",
+//	g_debug("drop path: indices=[%d,%d]:%d, path=%s\n",
 //			indices[0], indices[1], gtk_tree_path_get_depth(path),
 //			gtk_tree_path_to_string(path));
 
diff --git a/src/gui.c b/src/gui.c
index 4545c85..7d41355 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -1630,8 +1630,7 @@ gkrellm_load_theme_config(void)
 			{
 			if ((s = strchr(buf, (gint) '\n')) != NULL)
 				*s = '\0';
-			if (_GK.debug_level & DEBUG_GUI)
-				printf("gkrellm_load_theme_config: %s\n", buf);
+			gkrellm_debug(DEBUG_GUI, "gkrellm_load_theme_config: %s\n", buf);
 			s = buf;
 			if (s && *s != '#' && *s != '\0' && strcmp(s, "Default"))
 				{
@@ -1645,8 +1644,7 @@ gkrellm_load_theme_config(void)
 				{
 				if ((s = strchr(buf, (gint) '\n')) != NULL)
 					*s = '\0';
-				if (_GK.debug_level & DEBUG_GUI)
-					printf("gkrellm_load_theme_config: %s\n", buf);
+				gkrellm_debug(DEBUG_GUI, "gkrellm_load_theme_config: %s\n", buf);
 				if (i == 0)
 					sscanf(buf, "%d", &_GK.theme_alternative);
 				if (i == 1 && !strstr(buf, "*-*"))	/* XXX Trap out GdkFont */
@@ -1684,8 +1682,8 @@ gkrellm_read_theme_event(GtkSettings  *settings)
 					/* so get the current gtk theme name and switch to it  */
 		{
 		g_object_get(_GK.gtk_settings, "gtk-theme-name", &theme_name, NULL);
-		if ((_GK.debug_level & DEBUG_GUI) && theme_name)
-			printf("notify::gtk-theme-name: %s\n", theme_name);
+		if (theme_name)
+			gkrellm_debug(DEBUG_GUI, "notify::gtk-theme-name: %s\n", theme_name);
 
 		if (   gkrellm_dup_string(&_GK.gtk_theme_name, theme_name)
 			&& _GK.track_gtk_theme_name
@@ -2125,8 +2123,8 @@ create_config_page(GkrellmMonitor *mon, GtkTreeStore *tree, GtkTreeIter *iter,
 			PAGE_COLUMN, page,
 			-1);
 
-	if (_GK.debug_level & DEBUG_GUI)
-		printf("create_config_page %d: %s\n", page, mon ? mon->name : "--");
+	gkrellm_debug(DEBUG_GUI, "create_config_page %d: %s\n", page,
+		mon ? mon->name : "--");
 
 	return vbox;
 	}
@@ -2196,9 +2194,8 @@ gkrellm_remove_plugin_config_page(GkrellmMonitor *mon)
 			if (mon->privat->config_page >= tmon->privat->config_page)
 				continue;
 			tmon->privat->config_page -= 1;
-			if (_GK.debug_level & DEBUG_GUI)
-				printf("config_page %d: %s\n",
-						tmon->privat->config_page,  tmon->name);
+			gkrellm_debug(DEBUG_GUI, "config_page %d: %s\n",
+				tmon->privat->config_page, tmon->name);
 			}
 		}
 	mon->privat->config_page = -1;
@@ -2261,9 +2258,8 @@ cb_tree_selection_changed(GtkTreeSelection *selection, gpointer data)
 	set_apply_mode(instant);
 
 	gtk_notebook_set_current_page(config_notebook, page);
-	if (_GK.debug_level & DEBUG_GUI)
-		printf("tree_selection_changed %d: %s\n",
-					page, selected_monitor ? selected_monitor->name : "--");
+	gkrellm_debug(DEBUG_GUI, "tree_selection_changed %d: %s\n",
+		page, selected_monitor ? selected_monitor->name : "--");
 	}
 
   /* Monitors may want to present as instant apply monitors, but still need
diff --git a/src/inet.c b/src/inet.c
index f6431e2..d1841e1 100644
--- a/src/inet.c
+++ b/src/inet.c
@@ -170,7 +170,7 @@ _log_active_port(ActiveTCP *tcp)
 	if (_GK.debug_level & DEBUG_INET)
 		{
 		ap = inet_ntoa(tcp->remote_addr);
-		g_print("inet  OO----->  %x %s:%x\n",
+		g_debug("inet  OO----->  %x %s:%x\n",
 				tcp->local_port, ap, tcp->remote_port);
 		}
 	active_tcp_list = g_list_prepend(active_tcp_list, (gpointer) new_tcp);
@@ -248,7 +248,7 @@ gkrellm_inet_client_divert(void (*read_tcp_func)())
 
 /* ======================================================================== */
 
-#define DUMP_IN(in,tag)	printf("%s: %s %s %ld %ld %ld %ld\n", \
+#define DUMP_IN(in,tag)	g_debug("%s: %s %s %ld %ld %ld %ld\n", \
 						tag, in->label0, in->label1, \
             			in->port0_0, in->port0_1, in->port1_0, in->port1_1);
 
@@ -560,7 +560,7 @@ update_inet(void)
 				if (_GK.debug_level & DEBUG_INET)
 					{
 					ap = inet_ntoa(tcp->remote_addr);
-					g_print("inet  XX----->  %x %s:%x\n",
+					g_debug("inet  XX----->  %x %s:%x\n",
 							tcp->local_port, ap, tcp->remote_port);
 					}
 				free_tcp_list = g_list_prepend(free_tcp_list, tcp);
@@ -1104,12 +1104,14 @@ fix_ports(InetMon *in)
 
 	if (!*in->label0)
 		{
-		in->port0_1 = in->port0_1 = in->data0_is_range = 0;
+		in->port0_1 = 0;
+		in->data0_is_range = 0;
 		--cd_length;
 		}
 	if (!*in->label1)
 		{
-		in->port1_1 = in->port1_1 = in->data1_is_range = 0;
+		in->port1_1 = 0;
+		in->data1_is_range = 0;
 		--cd_length;
 		}
 	if (in->data0_is_range && (in->port0_1 < in->port0_0))
diff --git a/src/krell.c b/src/krell.c
index b52cbe8..449a244 100644
--- a/src/krell.c
+++ b/src/krell.c
@@ -958,7 +958,7 @@ gkrellm_create_krell(GkrellmPanel *p, GkrellmPiximage *im, GkrellmStyle *style)
 
 	if (im == NULL || style == NULL)
 		{
-		printf(_("create_krell: NULL image or style\n"));
+		g_warning(_("create_krell: NULL image or style\n"));
 		exit(0);
 		}
 
diff --git a/src/mail.c b/src/mail.c
index 67eb992..4d9d902 100644
--- a/src/mail.c
+++ b/src/mail.c
@@ -3220,12 +3220,12 @@ set_list_store_model_data(GtkListStore *store, GtkTreeIter *iter,
 		{
 		default_port = default_port_of_proto(account->protocol,
 						     account->use_ssl);
-		sprintf(abuf, "%s",
+		snprintf(abuf, sizeof(abuf), "%s",
 			auth_string(account->protocol, account->authmech));
 		mailbox = g_strdup(account->server);
 		if (account->port != atoi(default_port))
 			{
-			sprintf(pbuf, ":%d", account->port);
+			snprintf(pbuf, sizeof(pbuf), ":%d", account->port);
 			s = g_strconcat(mailbox, pbuf, NULL);
 			g_free(mailbox);
 			mailbox = s;
@@ -3243,7 +3243,7 @@ set_list_store_model_data(GtkListStore *store, GtkTreeIter *iter,
 		}
 	else
 		{
-		sprintf(abuf, "%s", mbox_strings[account->mboxtype & 0xf]);
+		snprintf(abuf, sizeof(abuf), "%s", mbox_strings[account->mboxtype & 0xf]);
 		mailbox = g_strdup_printf("%s", account->homedir_path ?
 					account->homedir_path : account->path);
 		}
@@ -3466,7 +3466,7 @@ cb_tree_selection_changed(GtkTreeSelection *selection, gpointer data)
 			account->port = default_port;
 		active = (account->port == default_port) ? FALSE : TRUE;
 		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(port_button), active);
-		sprintf(buf, "%d", account->port);
+		snprintf(buf, sizeof(buf), "%d", account->port);
 		gtk_entry_set_text(GTK_ENTRY(port_entry), buf);		
 		}
 	else if (local_supported)
diff --git a/src/main.c b/src/main.c
index 9a86715..a8934b9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2050,9 +2050,10 @@ gkrellm_abort(gint sig)
 		do_xmessage = FALSE;
 		}
 
+	// FIXME: xmessage is only available on X11
 	snprintf(buf, sizeof(buf), "xmessage gkrellm %s:  %s  (%s)", fault,
 				(mon && mon->name) ? mon->name : "", state);
-	printf("%s\n", buf + 9);
+	g_warning("%s\n", buf + 9);
 	if (do_xmessage)
 		g_spawn_command_line_async(buf, NULL);
 
diff --git a/src/plugins.c b/src/plugins.c
index a5af770..df608cb 100644
--- a/src/plugins.c
+++ b/src/plugins.c
@@ -179,7 +179,7 @@ get_style_from_list(GList *list, gint n)
 		l = list;
 	if (l->data == NULL)
 		{
-		printf("Warning: NULL style returned %d\n", n);
+		g_warning("Warning: NULL style returned %d\n", n);
 		abort();
 		}
 	style = (GkrellmStyle *) l->data;
@@ -283,7 +283,7 @@ get_piximage_from_list(GList *list, gint n)
 		l = list;
 	if (l->data == NULL)
 		{
-		printf("Warning: NULL image returned %d\n", n);
+		g_warning("Warning: NULL image returned %d\n", n);
 		abort();
 		}
 	return (GkrellmPiximage *) l->data;
diff --git a/src/sensors.c b/src/sensors.c
index a80d671..546df4f 100644
--- a/src/sensors.c
+++ b/src/sensors.c
@@ -529,9 +529,9 @@ sensor_read_temperature(Sensor *sensor, gfloat *temp, gchar *units)
 	   	else
 			*units = '\0';
 		}
-	if ((_GK.debug_level & DEBUG_SENSORS) && sensor)
-		printf("sensor_temp: %s %s t=%.2f\n",
-					sensor->name_locale, sensor->path, sensor->value);
+	if (sensor)
+		gkrellm_debug(DEBUG_SENSORS, "sensor_temp: %s %s t=%.2f\n",
+			sensor->name_locale, sensor->path, sensor->value);
 	if (found_temp && sensor)
 		gkrellm_check_alert(sensor->alert, sensor->value);
 	return found_temp;
@@ -565,9 +565,9 @@ sensor_read_fan(Sensor *sensor, gfloat *fan)
 		}
 	if (fan)
 		*fan = f;
-	if ((_GK.debug_level & DEBUG_SENSORS) && sensor)
-		printf("sensor_fan: %s %s rpm=%.0f\n",
-					sensor->name_locale, sensor->path, sensor->value);
+	if (sensor)
+		gkrellm_debug(DEBUG_SENSORS, "sensor_fan: %s %s rpm=%.0f\n",
+			sensor->name_locale, sensor->path, sensor->value);
 	if (found_fan && sensor)
 		gkrellm_check_alert(sensor->alert, sensor->value);
 	return found_fan;
@@ -605,9 +605,9 @@ sensor_read_voltage(Sensor *sensor, gfloat *voltage)
 		}
 	if (voltage)
 		*voltage = v;
-	if ((_GK.debug_level & DEBUG_SENSORS) && sensor)
-		printf("sensor_voltage: %s %s v=%.2f\n",
-				sensor->name_locale, sensor->path, sensor->value);
+	if (sensor)
+		gkrellm_debug(DEBUG_SENSORS, "sensor_voltage: %s %s v=%.2f\n",
+			sensor->name_locale, sensor->path, sensor->value);
 	if (found_voltage && sensor)
 		gkrellm_check_alert(sensor->alert, sensor->value);
 	return found_voltage;
@@ -1731,7 +1731,7 @@ save_sensors_config(FILE *f_not_used)
 
 	if (!sensor_list || _GK.no_config)
 		return;
-	sprintf(buf, "%s/%s", GKRELLM_DIR, SENSOR_CONFIG_FILE);
+	snprintf(buf, sizeof(buf), "%s/%s", GKRELLM_DIR, SENSOR_CONFIG_FILE);
 	config = gkrellm_make_config_file_name(gkrellm_homedir(), buf);
 	f = g_fopen(config, "w");
 	g_free(config);
@@ -1810,8 +1810,8 @@ load_sensors_config(gchar *arg)
 	n = sscanf(arg, "%31s %[^\n]", config, item);
 	if (n != 2)
 		return;
-	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("load_sensors_config: <%s> <%s>\n", config, item);
+	gkrellm_debug(DEBUG_SENSORS, "load_sensors_config: <%s> <%s>\n", config,
+		item);
 	if (!strcmp(config, "sensor_config_version"))
 		sscanf(item, "%d", &sensor_config_version);
 	else if (!strcmp(config, "sensor_sysdep_private"))
@@ -1912,14 +1912,14 @@ read_sensors_config(void)
 	gchar	*config;
 	gchar	buf[CFG_BUFSIZE];
 
-	sprintf(buf, "%s/%s", GKRELLM_DIR, SENSOR_CONFIG_FILE);
+	snprintf(buf, sizeof(buf), "%s/%s", GKRELLM_DIR, SENSOR_CONFIG_FILE);
 	config = gkrellm_make_config_file_name(gkrellm_homedir(), buf);
 	f = g_fopen(config, "r");
 	g_free(config);
 
 	if (!f)
 		{
-		sprintf(buf, "%s/%s", GKRELLM_DIR, SENSOR_2_1_14_CONFIG_FILE);
+		snprintf(buf, sizeof(buf), "%s/%s", GKRELLM_DIR, SENSOR_2_1_14_CONFIG_FILE);
 		config = gkrellm_make_config_file_name(gkrellm_homedir(), buf);
 		f = g_fopen(config, "r");
 		g_free(config);
@@ -2163,7 +2163,7 @@ row_drop_possible(GtkTreeDragDest *drag_dest, GtkTreePath *path,
 	src_path = gtk_tree_row_reference_get_path(row_reference);
 	src_indices = gtk_tree_path_get_indices(src_path);
 	dst_indices = gtk_tree_path_get_indices(path);
-//printf("drop path: indices=[%d,%d]:%d, path=%s\n",
+//g_debug("drop path: indices=[%d,%d]:%d, path=%s\n",
 //	dst_indices[0], dst_indices[1], gtk_tree_path_get_depth(path),
 //	gtk_tree_path_to_string(path));
 
@@ -2469,7 +2469,7 @@ cb_tree_selection_changed(GtkTreeSelection *selection, gpointer data)
 	path = gtk_tree_model_get_path(model, &iter);
 	indices = gtk_tree_path_get_indices(path);
 	depth = gtk_tree_path_get_depth(path);
-//printf("selection: indices=[%d,%d]:%d, path=%s\n",
+//g_debug("selection: indices=[%d,%d]:%d, path=%s\n",
 //		indices[0], indices[1], gtk_tree_path_get_depth(path),
 //		gtk_tree_path_to_string(path));
     change_row_reference(model, path);
diff --git a/src/sysdeps/freebsd.c b/src/sysdeps/freebsd.c
index fec5771..e6a1893 100644
--- a/src/sysdeps/freebsd.c
+++ b/src/sysdeps/freebsd.c
@@ -1648,7 +1648,7 @@ scan_for_sensors(void)
 						chip_dir, dentry->d_name);
 			if ((iodev = open(temp_file, O_RDWR)) == -1)
 				continue;
-			sprintf(id_name, "%s%3s", "temp", dentry->d_name + 3);
+			snprintf(id_name, sizeof(id_name), "%s%3s", "temp", dentry->d_name + 3);
 			interface = INTERFACE_SMB;
 			if (!gkrellm_sys_sensors_get_temperature(NULL, 0, iodev,
 					interface, NULL))
@@ -1693,7 +1693,7 @@ scan_for_sensors(void)
 				if (!gkrellm_sys_sensors_get_fan(NULL, id, iodev,
 						interface, NULL))
 					continue;
-				sprintf(id_name, "%s%d", "fan", id);
+				snprintf(id_name, sizeof(id_name), "%s%d", "fan", id);
 				sensors_add_sensor(SENSOR_FAN, id_name, id,
 						iodev, interface,
 						1.0 / (gfloat) fandiv[id], 0.0,
@@ -1705,7 +1705,7 @@ scan_for_sensors(void)
 			if (!gkrellm_sys_sensors_get_voltage(NULL, id, iodev,
 					interface, NULL))
 				continue;
-			sprintf(id_name, "%s%d", "in", id);
+			snprintf(id_name, sizeof(id_name), "%s%d", "in", id);
 			sensors_add_sensor(SENSOR_VOLTAGE, id_name, id,
 					iodev, interface,
 					voltdefault0[id].factor, 0.0,
diff --git a/src/sysdeps/linux.c b/src/sysdeps/linux.c
index d3d1006..e550e1b 100644
--- a/src/sysdeps/linux.c
+++ b/src/sysdeps/linux.c
@@ -718,9 +718,9 @@ gkrellm_sys_disk_init(void)
 		}
 	if (f)
 		fclose(f);
-	if (_GK.debug_level & DEBUG_SYSDEP)
-		printf("diskstats=%d partition_stats=%d sysfs_stats=%d\n",
-			have_diskstats, have_partition_stats, have_sysfs_stats);
+	gkrellm_debug(DEBUG_SYSDEP,
+		"diskstats=%d partition_stats=%d sysfs_stats=%d\n", have_diskstats,
+		have_partition_stats, have_sysfs_stats);
 
 	return TRUE;
 	}
@@ -1050,7 +1050,7 @@ gkrellm_sys_net_isdn_online(void)
 	   ) 
 		{
 		if (_GK.debug_level & DEBUG_NET)
-			printf("sys_net_isdn__online: no /dev/isdninfo?\n");
+			g_debug("sys_net_isdn__online: no /dev/isdninfo?\n");
 		return FALSE;
 		}
 	memset(buffer, 0, BUFSIZ);
@@ -1124,7 +1124,7 @@ get_io_indices(void)
 		fclose(f);
 		}
 	if (_GK.debug_level & DEBUG_NET)
-		printf("rx_bytes=%d tx_bytes=%d rx_packets=%d tx_packets=%d\n",
+		g_debug("rx_bytes=%d tx_bytes=%d rx_packets=%d tx_packets=%d\n",
 				rx_bytes_index, tx_bytes_index,
 				rx_packets_index, tx_packets_index);
 	}
@@ -1513,7 +1513,7 @@ setup_acpi_battery(gchar *bat)
 
 	info = g_strconcat(ACPI_BATTERY_DIR, bat, "/info", NULL);
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf("setup_acpi_battery: %s\n", info);
+		g_debug("setup_acpi_battery: %s\n", info);
 	if (!access(info, F_OK))
 		{
 		bf = g_new0(BatteryFile, 1);
@@ -1524,7 +1524,7 @@ setup_acpi_battery(gchar *bat)
 			bf->state = get_acpi_battery_file(ACPI_BATTERY_DIR, bat, "status");
 		acpi_battery_list = g_list_append(acpi_battery_list, bf);
 		if (_GK.debug_level & DEBUG_BATTERY)
-			printf("setup_acpi_battery: %s\n",
+			g_debug("setup_acpi_battery: %s\n",
 						bf->state ? bf->state : "no state");
 		return TRUE;
 		}
@@ -1542,7 +1542,7 @@ setup_ac_adapter(gchar **state, gchar *ac)
 		path = get_acpi_battery_file(ACPI_AC_ADAPTOR_DIR, ac, "status");
 	*state = path;
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf("setup_ac_adaptor: %s\n", path ? path : "no state");
+		g_debug("setup_ac_adaptor: %s\n", path ? path : "no state");
 
 	return path ? TRUE : FALSE;
 	}
@@ -1614,7 +1614,7 @@ acpi_battery_data(BatteryFile *bf)
 	if (!bf->got_full_cap)	/* get battery capacity */
 		{
 		if (_GK.debug_level & DEBUG_BATTERY)
-			printf("getting full capacity: %s\n", bf->info);
+			g_debug("getting full capacity: %s\n", bf->info);
 		if ((f = fopen(bf->info, "r")) == NULL)
 			return FALSE;
 		bf->got_full_cap = TRUE;
@@ -1636,10 +1636,10 @@ acpi_battery_data(BatteryFile *bf)
 			*/
 			if (sscanf(buf, "design capacity: %d", &bf->full_cap) == 1)
 				if (_GK.debug_level & DEBUG_BATTERY)
-					printf("%s: %d <- %s", bf->info, bf->full_cap, buf);
+					g_debug("%s: %d <- %s", bf->info, bf->full_cap, buf);
 			if (sscanf(buf, "last full capacity: %d", &bf->full_cap) == 1)
 				if (_GK.debug_level & DEBUG_BATTERY)
-					printf("%s: %d <- %s", bf->info, bf->full_cap, buf);
+					g_debug("%s: %d <- %s", bf->info, bf->full_cap, buf);
 			}
 		fclose(f);
 		}
@@ -1696,7 +1696,7 @@ acpi_battery_data(BatteryFile *bf)
 		if (sscanf(buf, "remaining capacity: %d", &cur_cap) == 1)
 			{
 			if (_GK.debug_level & DEBUG_BATTERY)
-				printf("%s: %d <- %s", bf->state, cur_cap, buf);
+				g_debug("%s: %d <- %s", bf->state, cur_cap, buf);
 			continue;
 			}
 		if (sscanf(buf, "present rate: %d", &cur_rate) == 1)
@@ -1709,7 +1709,7 @@ acpi_battery_data(BatteryFile *bf)
 	fclose(f);
 
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf(
+		g_debug(
 			"Battery: on_line=%d charging=%d have_charging=%d state_file=%d\n",
 			on_line, charging, have_charging_state,
 			acpi_ac_state_file ? TRUE : FALSE);
@@ -1743,9 +1743,9 @@ acpi_battery_data(BatteryFile *bf)
 
 	if (_GK.debug_level & DEBUG_BATTERY)
 		{
-		printf("Battery %d: percent=%d time_left=%d cur_cap=%d full_cap=%d\n",
+		g_debug("Battery %d: percent=%d time_left=%d cur_cap=%d full_cap=%d\n",
 				bf->id, percent, time_left, cur_cap, bf->full_cap);
-		printf("            available=%d on_line=%d charging=%d fc_bug=%d\n",
+		g_debug("            available=%d on_line=%d charging=%d fc_bug=%d\n",
 			available, on_line, charging, bf->full_cap_bug);
 		}
 	gkrellm_battery_assign_data(bf->id, available, on_line, charging,
@@ -1810,14 +1810,14 @@ read_sysfs_entry (gchar *buf, gint buflen, gchar const *sysentry)
 				*nl = '\0';
 			fclose (f);
 			if (_GK.debug_level & DEBUG_BATTERY)
-				printf ("read_sysfs_entry: %s = %s\n",
+				g_debug ("read_sysfs_entry: %s = %s\n",
 		        	sysentry, buf);
 			return TRUE;
 			}
 		fclose (f);
 		}
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf ("read_sysfs_entry: cannot read %s\n", sysentry);
+		g_debug ("read_sysfs_entry: cannot read %s\n", sysentry);
 	return FALSE;
 	}
 
@@ -1909,7 +1909,7 @@ setup_sysfs_ac_power (gchar const *sysdir)
 	syspower	*sp;
 
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf ("setup_sysfs_ac_power: %s\n", sysdir);
+		g_debug ("setup_sysfs_ac_power: %s\n", sysdir);
 	sp = g_new0 (syspower, 1);
 	sp->type			= PWRTYPE_MAINS;
 	sp->id				= g_pwr_id++;
@@ -1940,7 +1940,7 @@ setup_sysfs_battery (gchar const *sysdir)
 	 * pretty.)
 	 */
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf ("setup_sysfs_battery: %s\n", sysdir);
+		g_debug ("setup_sysfs_battery: %s\n", sysdir);
 	units = CHGUNITS_uWH;
 	sys_charge_full = g_strconcat (sysdir, "/energy_full", NULL);
 	if (access (sys_charge_full, F_OK | R_OK))
@@ -2005,7 +2005,7 @@ done:
 	/*  Battery power sources are appended to the end of the list.  */
 	g_sysfs_power_list = g_list_append (g_sysfs_power_list, sp);
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf ("setup_sysfs_battery: %s, %s\n",
+		g_debug ("setup_sysfs_battery: %s, %s\n",
 		        sys_charge_full, sys_charge_now);
 	retval = TRUE;
 
@@ -2036,7 +2036,7 @@ setup_sysfs_power_entry (gchar const *sysentry)
 
 		type = g_strconcat (sysdir, "/type", NULL);
 		if (_GK.debug_level & DEBUG_BATTERY)
-			printf ("setup_sysfs_power_entry: checking %s\n", type);
+			g_debug ("setup_sysfs_power_entry: checking %s\n", type);
 		if (read_sysfs_entry (buf, sizeof (buf), type))
 			{
 			if (!strcasecmp (buf, SYSFS_TYPE_AC_ADAPTER))
@@ -2044,7 +2044,7 @@ setup_sysfs_power_entry (gchar const *sysentry)
 			else if (!strcasecmp (buf, SYSFS_TYPE_BATTERY))
 				retval = setup_sysfs_battery (sysdir);
 			else if (_GK.debug_level & DEBUG_BATTERY)
-				printf ("setup_sysfs_power_entry: unknown power type: %s\n",
+				g_debug ("setup_sysfs_power_entry: unknown power type: %s\n",
 						buf);
 			}
 		g_free (type);
@@ -2062,7 +2062,7 @@ sysfs_power_setup (void)
 	gboolean		retval = FALSE;
 
 	if (_GK.debug_level & DEBUG_BATTERY)
-		printf ("sysfs_power_setup() entry\n");
+		g_debug ("sysfs_power_setup() entry\n");
 	if ((d = opendir (SYSFS_POWER_SUPPLIES)) == NULL)
 		return retval;
 
@@ -2366,7 +2366,7 @@ sensors_config_migrate(gchar *current_name, gchar *config_name,
 				{
 				if (_GK.debug_level & DEBUG_SENSORS)
 					{
-					printf("migrate name %s->%s: %s -> %s\n",
+					g_debug("migrate name %s->%s: %s -> %s\n",
 							(config == SENSOR_NAMES_I2C) ? "i2c" : "hwmon",
 							(current == SENSOR_NAMES_LIBSENSORS) ?
 									"libsensors" : "hwmon",
@@ -2401,7 +2401,7 @@ sensors_config_migrate(gchar *current_name, gchar *config_name,
 				{
 				if (_GK.debug_level & DEBUG_SENSORS)
 					{
-					printf("migrate name %s->%s: %s -> %s\n",
+					g_debug("migrate name %s->%s: %s -> %s\n",
 							(config == SENSOR_NAMES_LIBSENSORS) ?
 									"libsensors" : "hwmon",
 							(current == SENSOR_NAMES_I2C) ? "i2c" : "hwmon",
@@ -2458,20 +2458,20 @@ libsensors_init(void)
 	if (!f)
 		{
 		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("libsensors: could not open /etc/sensors.conf\n");
+			g_debug("libsensors: could not open /etc/sensors.conf\n");
 		return FALSE;
 		}
 
 	if (sensors_init(f) != 0)
 		{
 		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("libsensors: init failed!\n");
+			g_debug("libsensors: init failed!\n");
 		return FALSE;
 		}
 	fclose(f);
 
 	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("libsensors: init OK\n");
+		g_debug("libsensors: init OK\n");
 
 	n_sensors_added = 0;
 	nr = 0;
@@ -2506,7 +2506,7 @@ libsensors_init(void)
 				else
 					{
 					if (_GK.debug_level & DEBUG_SENSORS)
-						printf("libsensors: error determining type for: %s\n",
+						g_debug("libsensors: error determining type for: %s\n",
 								id_name);
 					continue;
 					}
@@ -2516,14 +2516,14 @@ libsensors_init(void)
 				if (name->bus != ((name->bus << 16) >> 16))
 					{
 					if (_GK.debug_level & DEBUG_SENSORS)
-						printf("libsensors: bus bigger than 16 bits: %s\n",
+						g_debug("libsensors: bus bigger than 16 bits: %s\n",
 								id_name);
 					continue;
 					}
 				if (name->addr != ((name->addr << 16) >> 16))
 					{
 					if (_GK.debug_level & DEBUG_SENSORS)
-						printf("libsensors: addr bigger than 16 bits: %s\n",
+						g_debug("libsensors: addr bigger than 16 bits: %s\n",
 								id_name);
 					continue;
 					}
@@ -2536,7 +2536,7 @@ libsensors_init(void)
 				if (sensors_get_label(*name, feature->number, &label) != 0)
 					{
 					if (_GK.debug_level & DEBUG_SENSORS)
-						printf("libsensors: error getting label for: %s\n",
+						g_debug("libsensors: error getting label for: %s\n",
 								id_name);
 					label = NULL;
 					}
@@ -2544,12 +2544,12 @@ libsensors_init(void)
 	if (sensors_init(NULL) != 0)
 		{
 		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("libsensors: init failed!\n");
+			g_debug("libsensors: init failed!\n");
 		return FALSE;
 		}
 
 	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("libsensors: init OK\n");
+		g_debug("libsensors: init OK\n");
 
 	n_sensors_added = 0;
 	nr = 0;
@@ -2597,7 +2597,7 @@ libsensors_init(void)
 				break;
 			  default:
 				if (_GK.debug_level & DEBUG_SENSORS)
-					printf("libsensors: error determining type for: %s\n",
+					g_debug("libsensors: error determining type for: %s\n",
 							id_name);
 				continue;
 			  }
@@ -2605,7 +2605,7 @@ libsensors_init(void)
 			if (!feature)
 				{
 				if (_GK.debug_level & DEBUG_SENSORS)
-					printf("libsensors: error could not get input subfeature for: %s\n",
+					g_debug("libsensors: error could not get input subfeature for: %s\n",
 							id_name);
 				continue;
 				}
@@ -2616,21 +2616,21 @@ libsensors_init(void)
 			if (name->bus.type != ((name->bus.type << 24) >> 24))
 				{
 				if (_GK.debug_level & DEBUG_SENSORS)
-					printf("libsensors: bus-type bigger than 8 bits: %s\n",
+					g_debug("libsensors: bus-type bigger than 8 bits: %s\n",
 							id_name);
 				continue;
 				}
 			if (name->bus.nr != ((name->bus.nr << 24) >> 24))
 				{
 				if (_GK.debug_level & DEBUG_SENSORS)
-					printf("libsensors: bus-nr bigger than 8 bits: %s\n",
+					g_debug("libsensors: bus-nr bigger than 8 bits: %s\n",
 							id_name);
 				continue;
 				}
 			if (name->addr != ((name->addr << 16) >> 16))
 				{
 				if (_GK.debug_level & DEBUG_SENSORS)
-					printf("libsensors: addr bigger than 16 bits: %s\n",
+					g_debug("libsensors: addr bigger than 16 bits: %s\n",
 							id_name);
 				continue;
 				}
@@ -2644,7 +2644,7 @@ libsensors_init(void)
 
 			label = sensors_get_label(name, main_feature);
 			if (!label && (_GK.debug_level & DEBUG_SENSORS))
-				printf("libsensors: error getting label for: %s\n",
+				g_debug("libsensors: error getting label for: %s\n",
 						id_name);
 
 			/* additional { to match "if (get_ignored(..) {"
@@ -2693,7 +2693,7 @@ libsensors_init(void)
 					free(label);
 
 				if (_GK.debug_level & DEBUG_SENSORS)
-					printf("%s %s %x\n",
+					g_debug("%s %s %x\n",
 							sensor_path, id_name,
 							iodev);
 
@@ -2730,7 +2730,7 @@ libsensors_get_value(char *sensor_path, int id, int iodev, float *value)
 	if (!p)
 		{
 		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("libsensors: error parsing sensor_path: %s\n",
+			g_debug("libsensors: error parsing sensor_path: %s\n",
 					sensor_path);
 		return FALSE;
 		}
@@ -2748,11 +2748,11 @@ libsensors_get_value(char *sensor_path, int id, int iodev, float *value)
 	if (!result && (_GK.debug_level & DEBUG_SENSORS))
 		{
 		if (name.bus >= 0)
-			printf(
+			g_debug(
 				"libsensors: error getting value for: %s@%d:%x feature: %d\n",
 				name.prefix, name.bus, name.addr, id);
 		else
-			printf("libsensors: error getting value for: %s@%x feature: %d\n",
+			g_debug("libsensors: error getting value for: %s@%x feature: %d\n",
 					name.prefix, name.addr, id);
 		}
 
@@ -2771,12 +2771,12 @@ libsensors_get_value(char *sensor_path, int id, int iodev, float *value)
 			  {
 			  case SENSORS_BUS_TYPE_I2C:
 			  case SENSORS_BUS_TYPE_SPI:
-				printf(
+				g_debug(
 					"libsensors: error getting value for: %s@%d:%x feature: %d\n",
 					name.prefix, (int)name.bus.nr, name.addr, id);
 				break;
 			  default:
-				printf("libsensors: error getting value for: %s@%x feature: %d\n",
+				g_debug("libsensors: error getting value for: %s@%x feature: %d\n",
 					name.prefix, name.addr, id);
 			  }
 		}
@@ -3407,7 +3407,7 @@ sysfs_sensors_init(void)
 			}
 		have_sysfs_sensors = TRUE;
 		if (_GK.debug_level & DEBUG_SENSORS)
-				printf("sysfs sensors dir: %s\n", path);
+				g_debug("sysfs sensors dir: %s\n", path);
 
 		get_volt_default(chip_name, &voltdefault, &voltdefaultsize);
 		while ((name = (gchar *) g_dir_read_name(chip_dir)) != NULL)
@@ -3454,7 +3454,7 @@ sysfs_sensors_init(void)
 						id, 0, 0,
 						factor, offset, vref, default_label);
 			if (_GK.debug_level & DEBUG_SENSORS)
-				printf("%s %s %d %d\n",
+				g_debug("%s %s %d %d\n",
 							sensor_path, id_name, id, type);
 
 			if (!using_i2c_dir)
@@ -3506,7 +3506,7 @@ sensors_nvidia_settings_ngpus(void)
 	g_free(output);
 #endif
 	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("nvidia-settings gpus = %d\n", n);
+		g_debug("nvidia-settings gpus = %d\n", n);
 	return n;
 	}
 
@@ -3532,7 +3532,7 @@ sensors_nvclock_ngpus(void)
 	g_free(output);
 #endif
 	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("nvclock gpus = %d\n", n);
+		g_debug("nvclock gpus = %d\n", n);
 	return n;
 	}
 
@@ -3921,7 +3921,7 @@ gkrellm_sys_sensors_init(void)
 		}
 #else
 	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("libsensors support is not compiled in.\n");
+		g_debug("libsensors support is not compiled in.\n");
 
 #endif
 
@@ -3943,7 +3943,7 @@ gkrellm_sys_sensors_init(void)
 			continue;
 			}
 		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("lm_sensors dir: %s\n", path);
+			g_debug("lm_sensors dir: %s\n", path);
 
 		get_volt_default(chip_name, &voltdefault, &voltdefaultsize);
 		while ((sensor_name = (gchar *) g_dir_read_name(chip_dir)) != NULL)
@@ -3985,7 +3985,7 @@ gkrellm_sys_sensors_init(void)
 					factor, offset, vref, default_label);
 
 			if (_GK.debug_level & DEBUG_SENSORS)
-				printf("%s %s %d %d\n",
+				g_debug("%s %s %d %d\n",
 							sensor_path, id_name, id, type);
 			g_free(sensor_path);
 			}
diff --git a/src/sysdeps/sensors-common.c b/src/sysdeps/sensors-common.c
index d548cb4..2e81410 100644
--- a/src/sysdeps/sensors-common.c
+++ b/src/sysdeps/sensors-common.c
@@ -32,7 +32,6 @@
 */
 
 
-
 /* A system dependent interface can include this file to get sensors
 |  from daemons that can run under different operating systems.
 */
@@ -85,9 +84,8 @@ mbmon_decimal_point_check(gchar *buf)
 	if (mbmon_decimal_point_fix(s))
 		{
 		mbmon_need_decimal_point_fix = TRUE;
-		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("mbmon_need_decimal_point_fix: %c -> %c\n",
-					mbmon_decimal_point, gkrellm_decimal_point);
+		gkrellm_debug(DEBUG_SENSORS, "mbmon_need_decimal_point_fix: %c -> %c\n",
+			mbmon_decimal_point, gkrellm_decimal_point);
 		}
 	g_free(s);
 
@@ -143,9 +141,9 @@ mbmon_daemon_read(void)
 
 	if ((fd = gkrellm_connect_to(server, _GK.mbmon_port)) < 0)
 		{
-		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("mbmon_daemon_read: can't connect to %s:%d.\n",
-			       server, _GK.mbmon_port);
+		gkrellm_debug(DEBUG_SENSORS,
+			"mbmon_daemon_read: can't connect to %s:%d.\n", server,
+			_GK.mbmon_port);
 		return FALSE;
 		}
 
@@ -160,8 +158,7 @@ mbmon_daemon_read(void)
 		}
 	close(fd);
 
-	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("mbmon_daemon_read:\n%s\n", mbmon_gstring->str);
+	gkrellm_debug(DEBUG_SENSORS, "mbmon_daemon_read:\n%s\n", mbmon_gstring->str);
 
 	while (gkrellm_getline_from_gstring(&mbmon_gstring, buf, sizeof(buf)))
 		{
@@ -317,9 +314,9 @@ hddtemp_daemon_read(void)
 
 	if ((fd = gkrellm_connect_to(server, HDDTEMP_PORT)) < 0)
 		{
-		if (_GK.debug_level & DEBUG_SENSORS)
-			printf("hddtemp_daemon_read: can't connect to %s:%d.\n",
-			       server, HDDTEMP_PORT);
+		gkrellm_debug(DEBUG_SENSORS,
+			"hddtemp_daemon_read: can't connect to %s:%d.\n", server,
+			HDDTEMP_PORT);
 		return FALSE;
 		}
 
@@ -334,9 +331,8 @@ hddtemp_daemon_read(void)
 		}
 	close(fd);
 
-	if (_GK.debug_level & DEBUG_SENSORS)
-		printf("hddtemp_daemon_read (once a minute):\n\t%s\n",
-					hddtemp_gstring->str);
+	gkrellm_debug(DEBUG_SENSORS, "hddtemp_daemon_read (once a minute):\n\t%s\n",
+		hddtemp_gstring->str);
 
 	sep = hddtemp_gstring->str[0];
 	if (sep == '\0')
diff --git a/src/sysdeps/solaris.c b/src/sysdeps/solaris.c
index 73a1a10..a793eb1 100644
--- a/src/sysdeps/solaris.c
+++ b/src/sysdeps/solaris.c
@@ -468,9 +468,9 @@ check_media_type(kstat_t *ksp) {
                 return 0; /* guess it's removable media */
             } else {
 #ifdef DEBUG
-                printf("opening %s\n", devices_path);
-                printf("unexpected errno: %d\n", errno);
-                printf("disabled auto-detection/exclusion of removable media\n");
+                g_message("opening %s\n", devices_path);
+                g_message("unexpected errno: %d\n", errno);
+                g_message("disabled auto-detection/exclusion of removable media\n");
 #endif
                 close(fd);
                 di_devfs_path_free(phys_path);
@@ -773,11 +773,11 @@ gkrellm_sys_net_sync(void)
     }
 
 #ifdef DEBUG
-    printf("interfaces probed: ");
+    g_message("interfaces probed: ");
     for (i=0; i < numifs; i++) {
-        printf("%s ", ifc.ifc_req[i].ifr_name);
+        g_message("%s ", ifc.ifc_req[i].ifr_name);
     }
-    printf("\n");
+    g_message("\n");
 #endif
     
     ifrp = ifc.ifc_req;
diff --git a/src/utils.c b/src/utils.c
index fb47eec..69332dd 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -114,7 +114,7 @@ gkrellm_cut_quoted_string(gchar *src, gchar **endptr)
 			{
 			if (endptr)
 				*endptr = src;
-			printf(_("Unterminated quote\n"));
+			g_warning(_("Unterminated quote\n"));
 			return NULL;
 			}
 		*s = '\0';
@@ -230,7 +230,7 @@ gkrellm_make_home_subdir(gchar *subdir, gchar **path)
 	if (!g_file_test(dir, G_FILE_TEST_IS_DIR))
 		{
 		if (g_mkdir(dir, 0755) < 0)
-			printf(_("Cannot create directory: %s\n"), dir);
+			g_warning(_("Cannot create directory: %s\n"), dir);
 		else
 			result = TRUE;
 		}
diff --git a/src/winops-gtk-mac.c b/src/winops-gtk-mac.c
index b2b6846..d434373 100644
--- a/src/winops-gtk-mac.c
+++ b/src/winops-gtk-mac.c
@@ -129,7 +129,7 @@ gkrellm_winop_options(gint argc, gchar **argv)
 		&& !_gkrellm_get_lock()
 	   )
 		{
-		printf("gkrellm: %s\n",
+		g_message("gkrellm: %s\n",
 			_("Exiting because multiple instances option is off.\n"));
 		exit(0);
 		}
@@ -163,8 +163,7 @@ gkrellm_winop_place_gkrellm(gchar *geom)
 	_GK.y_position = y;
 	_GK.x_position = x;
 	_GK.position_valid = TRUE;
-	if (_GK.debug_level & DEBUG_POSITION)
-		printf("geometry moveto %d %d\n", x, y);
+	gkrellm_debug(DEBUG_POSITION, "geometry moveto %d %d\n", x, y);
 	*/
 	}
 
diff --git a/src/winops-x11.c b/src/winops-x11.c
index e5e7f1d..59138ac 100644
--- a/src/winops-x11.c
+++ b/src/winops-x11.c
@@ -383,7 +383,7 @@ gkrellm_winop_options(gint argc, gchar **argv)
 		&& !_gkrellm_get_lock()
 	   )
 		{
-		printf("gkrellm: %s\n",
+		g_message("gkrellm: %s\n",
 			_("Exiting because multiple instances option is off.\n"));
 		exit(0);
 		}
@@ -481,8 +481,7 @@ gkrellm_winop_place_gkrellm(gchar *geom)
 	_GK.y_position = y;
 	_GK.x_position = x;
 	_GK.position_valid = TRUE;
-	if (_GK.debug_level & DEBUG_POSITION)
-		printf("geometry moveto %d %d\n", x, y);
+	gkrellm_debug(DEBUG_POSITION, "geometry moveto %d %d\n", x, y);
 	}
 
 void