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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Thanks for the bug report. This particular bug has already been
reported, but feel free to report any other bugs you find.
** 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 i
** 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"
http://launchpadlibrarian.net/44696068/GConfN