Full X crash when changing # of desktops in switcher (running beryl)

Binary package hint: gnome-panel

Basically I am running Beryl with Emerald.

I noticed that my desktop switcher (which was set to 4 desktops originally to match my cube) was not properly displaying along with the Beryl cube, so I went into prefs and switched it to 2 desktops (original setting) causing the gnome-panel to die, then all windows dissapeared, and I could not even CTRL-ALT-BACKSPACE out. had to do a manual reboot.

ProblemType: Crash
Architecture: i386
Date: Thu Mar 22 10:18:40 2007
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/gnome-panel
Package: gnome-panel 2.18.0-0ubuntu2
PackageArchitecture: i386
ProcCmdline: gnome-panel --sm-client-id default1
ProcCwd: /home/dlavoie
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 wnck_workspace_get_width () from /usr/lib/libwnck-1.so.18
 _gtk_marshal_BOOLEAN__BOXED ()
 ?? () from /usr/lib/libgobject-2.0.so.0
 ?? ()
 ?? ()
Uname: Linux ROOT 2.6.20-12-generic #2 SMP Wed Mar 21 20:55:46 UTC 2007 i686 GNU/Linux
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin netdev plugdev powerdev scanner video