Public bug reported:

Install OpenOffice.org.  Open three OoO Writer windows.  Move the mouse
to the task list in the panel.  Right-click the task-list entry for one
OoO window and click `Close Window'.  Do the same for a second OoO
window.  The third OoO window and any other open windows remain
responsive, but the entire panel becomes unresponsive.  The only way to
regain full control is to press Ctrl+Alt+F1, log in, and run `sudo
/etc/init.d/lxdm restart'.

The same lock-up occurred once when I opened six or eight OoO windows
and held down Alt+F4 long enough for it to auto-repeat, so that all the
OoO windows closed quickly.  I was left with an unresponsive panel whose
task list showed two or three (non-existent) windows.

One wrinkle (probably not relevant): I'm running Lubuntu inside VMWare
Player 4.01 on top of 32-bit Kubuntu 9.10.  The following command output
(requested by Launchpad) was taken inside the VM running Lubuntu.

msl@lub1110:~$ lsb_release -rd
Description:    Ubuntu 11.10
Release:        11.10
msl@lub1110:~$ apt-cache policy lxpanel
lxpanel:
  Installed: 0.5.8-1ubuntu3
  Candidate: 0.5.8-1ubuntu3
  Version table:
 *** 0.5.8-1ubuntu3 0
        500 http://gb.archive.ubuntu.com/ubuntu/ oneiric/universe i386 Packages
        100 /var/lib/dpkg/status
msl@lub1110:~$ 

Let me take this opportunity to thank you for the hard work you put into
producing Lubuntu.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: lxpanel 0.5.8-1ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-15.26-generic 3.0.13
Uname: Linux 3.0.0-15-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Config_Home_Lubuntu:
 [Command]
 FileManager=pcmanfm %s
 Terminal=lxterminal -e
 Logout=lubuntu-logout
Date: Sun Feb  5 15:13:43 2012
InstallationMedia: Lubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANGUAGE=en_GB:en
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: lxpanel
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: apport-bug i386 oneiric

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https://bugs.launchpad.net/bugs/927185

Title:
  Panel crashes if two OoO windows are closed via panel

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