This problem affects me too. I've attached a screenshot.
** Attachment added: A screenshot. Notice the top right corner.
https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/566004/+attachment/1756110/+files/Power%20button.png
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** Changed in: gnome-panel (Ubuntu)
Importance: Undecided = Low
** Changed in: gnome-panel (Ubuntu)
Status: New = Invalid
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me menu gets corrupted, power off
** Attachment added: gnome-panel area affected
http://launchpadlibrarian.net/44696858/Screenshot.png
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/44696067/Dependencies.txt
** Attachment added: GConfNonDefault.txt
