Troubles with Notify OSD Gnome Shell 3.4

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http://askubuntu.com – thanks for answering with my doubt about the crashes of gnome 3.4, but I have another problem, a few weeks I noticed that the Notify OSD in Gnome Shell gone it. It isn't when I change a song with Rhythmbox or a Pidgin notification when a contact going out. I don't know if was using the Shell OSD extension. Beforehand thanks :) (HowTos)