New issue 685 by towolf: Stopped working in Gnome Shell 3.3.4
http://code.google.com/p/gnome2-globalmenu/issues/detail?id=685
Gnome has reshuffled the menu sytem and introduced the AppMenu concept.
Perhaps this can even be leveraged cleanly:
https://live.gnome.org/GnomeShell/Design/Whiteboards/AppMenu
https://mail.gnome.org/archives/gtk-devel-list/2011-December/msg00031.html