Do you have Compiz set to show a shadow? Maybe it's rendering wrong?
If you don't have compizconfig-settings-manager installed, please
install it and see if you can disable the shadow settings in there and
if it makes this go away.
** Changed in: ubuntu
Status: New => Incomplete
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Strange halo arround icon bar and some popup dialog boxes
https://bugs.launchpad.net/bugs/272566
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