[Bug 781815] [NEW] Menu cannot be displayed when switch back using meta+W

[QianPeng]

Public bug reported:

Binary package hint: firefox

I am using 11.04 Ubuntu
Window of firefox is Maximized.  Okular is maximize on another workstation.
I used meta+W to switch from firefox to Okular.  
Then I used meta+W to switch back to firefox.
After this , I found that if I right click, the menu could appear as usually, but as soon as I move the cursor on to the menu, it disappears. The same bug applies to other menus like the bookmark folder, selective options that appear when you are entering text in a textbox.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: firefox 4.0.1+build1+nobinonly-0ubuntu0.11.04.1
ProcVersionSignature: Ubuntu 2.6.35-27.48-generic-pae 2.6.35.11
Uname: Linux 2.6.35-27-generic-pae i686
Architecture: i386
Date: Thu May 12 13:01:00 2011
FirefoxPackages:
 firefox 4.0.1+build1+nobinonly-0ubuntu0.11.04.1
 flashplugin-installer 10.2.159.1ubuntu1
 adobe-flashplugin N/A
 icedtea-plugin 1.1~20110420-0ubuntu1
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox
UpgradeStatus: Upgraded to natty on 2011-05-11 (0 days ago)

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 natty running-unity

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https://bugs.launchpad.net/bugs/781815

Title:
  Menu cannot be displayed when switch back using meta+W