diff -Naur metacity-2.34.5.orig/src/compositor/compositor-xrender.c metacity-2.34.5/src/compositor/compositor-xrender.c
--- metacity-2.34.5.orig/src/compositor/compositor-xrender.c	2011-11-10 15:14:34.000000000 +0100
+++ metacity-2.34.5/src/compositor/compositor-xrender.c	2012-08-28 14:23:04.093750568 +0200
@@ -3066,6 +3057,8 @@
 #endif
 
   xrc->enabled = TRUE;
+  xrc->show_redraw = FALSE;
+  xrc->debug = FALSE;
   g_timeout_add (2000, (GSourceFunc) timeout_debug, xrc);
 
   return compositor;