diff -rup notification-daemon-0.3.7/src/themes/ubuntu/theme.c notification-daemon-0.3.7.new/src/themes/ubuntu/theme.c
--- notification-daemon-0.3.7/src/themes/ubuntu/theme.c	2007-04-03 01:29:05.000000000 +0200
+++ notification-daemon-0.3.7.new/src/themes/ubuntu/theme.c	2007-04-03 01:26:57.000000000 +0200
@@ -199,6 +199,8 @@ draw_border(GtkWidget *win, GdkEventExpo
 
 	// get the tooltip bg color and use it for the notifications
 	GtkTooltips *tips = gtk_tooltips_new();
+	g_object_ref_sink (tips);
+
 	// create a "fake" widget here to that we can attach the tips too
 	// and destory afterwards (to make sure we don't create a mem-leak
 	// for the tips)
@@ -209,6 +211,7 @@ draw_border(GtkWidget *win, GdkEventExpo
 	GtkStyle *style = gtk_widget_get_style(tips->tip_window);
 	GdkColor bg_color = style->bg[GTK_STATE_NORMAL];
 	gtk_widget_destroy(fake);
+	g_object_unref(tips);
 
 	cairo_set_source_rgb(cr, 
 			     bg_color.red/65535.0,
@@ -242,6 +245,9 @@ draw_border(GtkWidget *win, GdkEventExpo
 	cairo_fill(mask_cr);
 	gdk_window_shape_combine_mask (win->window, (GdkBitmap *) mask, 0, 0);
 
+	cairo_destroy (cr);
+	g_object_unref (mask);
+
 	return FALSE;
 }