Thanks for reporting this bug. Could you please check to see if the /apps/metacity/general/compositing_manager gconf key is set to false. Also, can you confirm that windows don't have shadows. The behaviour you describe seems to indicate a compositing manager is running, which the default Intel drivers don't support (compositing + launcher don't work together in Intel graphics).
Thanks for reporting this bug. Could you please check to see if the /apps/metacity/ general/ compositing_ manager gconf key is set to false. Also, can you confirm that windows don't have shadows. The behaviour you describe seems to indicate a compositing manager is running, which the default Intel drivers don't support (compositing + launcher don't work together in Intel graphics).