[Bug 22161] New: applications menu won't appear

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http://bugzilla.ubuntu.com/show_bug.cgi?id=22161
Ubuntu | gnome-panel

           Summary: applications menu won't appear
           Product: Ubuntu
           Version: unspecified
          Platform: All
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gnome-panel
        AssignedTo: seb128 at ubuntu.com
        ReportedBy: dooglus at gmail.com
         QAContact: desktop-bugs at lists.ubuntu.com


Over the last two days I've seen this happen twice.  The 'places' and 'system'
menu are both fine, but if I try to open the 'applications' menu, it appears for
a tiny fraction of a second and is then replaced by a small white square.  See
the attached screenshot.

I've tried removing the menu bar from the panel and adding it again, but that
doesn't fix it.

Logging out of GNOME and back in fixes the problem.

I've not been able to work out what triggers this.

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