diff -rupN orig/compiz-0.9.4+bzr20110407/src/screen.cpp patch/compiz-0.9.4+bzr20110407/src/screen.cpp
--- orig/compiz-0.9.4+bzr20110407/src/screen.cpp	2011-04-07 08:44:00.000000000 -0400
+++ patch/compiz-0.9.4+bzr20110407/src/screen.cpp	2011-04-10 20:37:38.301787634 -0400
@@ -665,6 +665,11 @@ PrivateScreen::syncStacks ()
 	screen->insertWindow (w, screen->windows ().size () ?
 				  screen->windows ().back ()->id () : 0);
 
+	if(children != NULL) 
+	{
+		XFree(children);
+	}
+
     return true;
 }