Thanks for your report, that's known upstream you can track it here:
http://bugzilla.gnome.org/show_bug.cgi?id=339353
** Changed in: metacity (Ubuntu)
Assignee: (unassigned) => Ubuntu Desktop Bugs (desktop-bugs)
Status: Confirmed => Triaged
** Also affects: metacity via
http://bugzilla.gnome.org/show_bug.cgi?id=339353
Importance: Unknown
Status: Unknown
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Panel buttonshow desktop does not display windows again after activity
https://bugs.launchpad.net/bugs/99595
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Desktop Bugs, which is a bug assignee.
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