Description of problem: after the new install of the F17 graphic test CD, and opening several programs in them blender, the installer, and setting the graphics to the highest resolution, if the activities overview mode is activated constantly, the woops there was a problem and gnome cannot recover log out message apears, then since the log out process starts and the message apears over and over again, no log in screen is shown, rebooting does not fix this.


How reproducible: every time I move the mouse over the hot corner while the overview is trying to show all the windows the message appears and, to fix this really fast, reinstall the system.


Steps to Reproduce:
1. log in
2. open 4 programs
3. move over to the hot corner several times while gnome-shell trys to show the windows
  
Actual results: you se the Woops message 


Expected results: the overview


Additional info: it never shows the log in screen ever again.