=== modified file 'src/defaults.c'
--- src/defaults.c	2009-09-29 09:52:49 +0000
+++ src/defaults.c	2009-10-09 10:31:12 +0000
@@ -2383,6 +2383,9 @@
 	gboolean is_panel = FALSE;
 	GdkRectangle frame;
 	int result;
+	GdkScreen *screen;
+	gint monitor;
+	GdkRectangle monitor_rect;
 
 	if (win == NULL) return FALSE;
 
@@ -2405,7 +2408,12 @@
 
 	/* select only the top panel */
 	gdk_window_get_frame_extents (win, &frame);
-	if (frame.x != 0 || frame.y != 0)
+
+	screen = gdk_drawable_get_screen(win);
+	monitor = gdk_screen_get_monitor_at_window(screen, win);
+	gdk_screen_get_monitor_geometry(screen, monitor, &monitor_rect);
+
+	if (frame.x != monitor_rect.x || frame.y != monitor_rect.y)
 		goto failed;
 
 	if (frame.width < frame.height)
@@ -2527,7 +2535,7 @@
 	    panel_monitor == monitor)
 	{
 		/* position the corner on the selected monitor */
-		rect.y += panel_rect.y + panel_rect.height;
+		rect.y = panel_rect.y + panel_rect.height;
 	} else if (! has_panel_window)
 	{
 		g_debug ("no panel detetected; using workarea fallback");