diff -up metacity-2.24.0/src/core/display.c~ metacity-2.24.0/src/core/display.c
--- metacity-2.24.0/src/core/display.c~	2008-08-18 08:29:06.000000000 -0400
+++ metacity-2.24.0/src/core/display.c	2008-10-31 15:19:02.000000000 -0400
@@ -3264,9 +3264,11 @@ meta_display_begin_grab_op (MetaDisplay 
   
   if (display->grab_op != META_GRAB_OP_NONE)
     {
+#if 0
       meta_warning ("Attempt to perform window operation %u on window %s when operation %u on %s already in effect\n",
                     op, window ? window->desc : "none", display->grab_op,
                     display->grab_window ? display->grab_window->desc : "none");
+#endif
       return FALSE;
     }