diff -Nur src.bak/main-window.c src/main-window.c
--- src.bak/main-window.c	2009-02-20 00:20:16.000000000 +0800
+++ src/main-window.c	2009-02-20 00:19:26.000000000 +0800
@@ -666,6 +666,14 @@
 
     g_signal_connect ( main_window, "focus-in-event",
                        G_CALLBACK ( on_main_window_focus ), NULL );
+                       
+    /*Set RGBA colormap*/
+	GdkScreen *screen = gtk_widget_get_screen(main_window);
+	GdkColormap *colormap = gdk_screen_get_rgba_colormap (screen);
+	if (colormap && gdk_screen_is_composited (screen)) {
+	gtk_widget_set_default_colormap(colormap);
+	}
+    /*End set RGBA colormap*/
 }
 
 void fm_main_window_finalize( GObject *obj )