I've been following the status of this bug for some time, and have seen it
appear on many installations, going back several releases. I believe the
problem has something to do with the indicator-applet-session panel applet.
I've found that when I remove this applet from the panel, the visual
corruption no longer occurs. I leave the indicator-applet alone, only
removing indicator-applet-session. When removed, all the essential
functionality of this applet is relocated to the "System" area of the Gnome
menu. It's a bonus that it removes some cruft from the panel area.
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https://bugs.launchpad.net/bugs/439448
Title:
Visual corruption affecting several panel applets
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