I have the same problem, but I do not know what action causes the blockage.
The only way I found and killed gnome-panel.
Why I do ctrl + alt + F1, then once connected:
sudo killall gnome-panel

Fresh install of 12.04 with gnome-session-callback / gnome-panel - no effects
Gnome Force Quit applet on gnome-panel.

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https://bugs.launchpad.net/bugs/1006490

Title:
  Gnome Classic 12.04 panel applet “Force Quit” locks up system,
  hardware reboot to recover

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