Could you please try after startup making an empty selection on the
desktop bakckground, and try it afterwards? I have the same issues, and
this workaround solved the problem in all cases, so if it solves it for
you, than this might be a duplicate bug.
** Changed in: unity (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/695899
Title:
Intermittent inability to popup menus in top panel
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