Index: screen.c
===================================================================
--- screen.c	(Revision 718)
+++ screen.c	(Arbeitskopie)
@@ -165,7 +165,8 @@
 static void kiba_window_state_changed_cb(KibaWindow *window, gint states_changed, gpointer data) {
 	KibaScreen *screen = KIBA_SCREEN_DEFAULT;
 
-	if (window->state & (1 << KIBA_WINDOW_CLOSED)) {
+	if (window->state & (1 << KIBA_WINDOW_CLOSED)
+	 || !(window->state & (1 << KIBA_WINDOW_MAPPED))) {
 		g_signal_emit (screen,
 			screen_signals[SIG_WINDOW_CLOSED],
 			0, window);
@@ -226,7 +227,10 @@
 			
 		if (kiba_screen_get_window (screen, gdk_window) != NULL)
 			continue;
-			
+		
+		if (gdk_window_get_state(gdk_window) & (1 << GDK_WINDOW_STATE_WITHDRAWN))
+			continue;
+
 		window = kiba_window_new (gdk_window);
 		
 		g_signal_connect_after(G_OBJECT(window), "state-changed",