Ubuntu 12.10 + Gnome 3 = Keyboard Layout Indicator is not working!

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http://askubuntu.com – I have two keyboard layouts, but keyboard layout indicator is only visible on login screen. After I login to system, I could not see it anymore! My problem is almost the same as following: Question #195194 But, I have the latest release of Gnome Shell, from official Gnome team repository: sudo add-apt-repository ppa:gnome3-team/gnome3 And other packages have the latest versions as well, so I doubt that this error happens because of a bug. Already tried the instructions mentioned in this thread: Gnome3 keyboard layout icon disappeared Especially the gnome-tweak-tool. Still unable to see (HowTos)