gnome-panel gutsy crashes when switching workspace

Binary package hint: gnome-panel

When I login, the bottom panel is automatically hidden. When I click (anywhere), the panel is restored. Then when I try changing workspace (by clicking in the switcher), the desktop crashes and I'm left with just the desktop background.

Here is the backtrace:

GNU gdb 6.6-debian
Copyright (C) 2006 Free Software Foundation, Inc.
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This GDB was configured as "i486-linux-gnu".
(gdb) handle SIGG33 pass onostop no print
Signal Stop Print Pass to program Description
SIG33 No No Yes Real-time event 33
(gdb) set pagination 0
(gdb) attach 5452
Attaching to process 5452
Reading symbols from /usr/bin/gnome-panel...(no debugging symbols found)...done.
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
Reading symbols from /usr/lib/libgnome-desktop-2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnome-desktop-2.so.2
Reading symbols from /usr/lib/libgnomeui-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnomeui-2.so.0
Reading symbols from /usr/lib/libbonoboui-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbonoboui-2.so.0
Reading symbols from /usr/lib/libgnomecanvas-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnomecanvas-2.so.0
Reading symbols from /usr/lib/libgnome-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnome-2.so.0
Reading symbols from /usr/lib/libbonobo-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbonobo-2.so.0
Reading symbols from /usr/lib/libbonobo-activation.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libbonobo-activation.so.4
Reading symbols from /usr/lib/libart_lgpl_2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libart_lgpl_2.so.2
Reading symbols from /usr/lib/libgnomevfs-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnomevfs-2.so.0
Reading symbols from /usr/lib/libglade-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libglade-2.0.so.0
Reading symbols from /usr/lib/libgtk-x11-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgtk-x11-2.0.so.0
Reading symbols from /usr/lib/libgdk-x11-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgdk-x11-2.0.so.0
Reading symbols from /usr/lib/libatk-1.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libatk-1.0.so.0
Reading symbols from /usr/lib/libgdk_pixbuf-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgdk_pixbuf-2.0.so.0
Reading symbols from /usr/lib/libpango-1.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpango-1.0.so.0
Reading symbols from /usr/lib/libcairo.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libcairo.so.2
Reading symbols from /usr/lib/libgconf-2.so.4...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgconf-2.so.4
Reading symbols from /usr/lib/libORBit-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libORBit-2.so.0
Reading symbols from /usr/lib/libgnome-menu.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnome-menu.so.2
Reading symbols from /usr/lib/libdbus-glib-1.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdbus-glib-1.so.2
Reading symbols from /usr/lib/libgobject-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgobject-2.0.so.0
Reading symbols from /usr/lib/libglib-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libglib-2.0.so.0
Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXau.so.6
Reading symbols from /usr/lib/libX11.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libX11.so.6
Reading symbols from /lib/tls/i686/cmov/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libm.so.6
Reading symbols from /lib/tls/i686/cmov/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread -1226434896 (LWP 5452)]
Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0
Reading symbols from /lib/tls/i686/cmov/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /usr/lib/libxml2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libxml2.so.2
Reading symbols from /usr/lib/libSM.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libSM.so.6
Reading symbols from /usr/lib/libICE.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libICE.so.6
Reading symbols from /lib/libpopt.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libpopt.so.0
Reading symbols from /usr/lib/libpangocairo-1.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpangocairo-1.0.so.0
Reading symbols from /usr/lib/libfontconfig.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfontconfig.so.1
Reading symbols from /usr/lib/libXext.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXext.so.6
Reading symbols from /usr/lib/libXrender.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXrender.so.1
Reading symbols from /usr/lib/libXinerama.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXinerama.so.1
Reading symbols from /usr/lib/libXi.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXi.so.6
Reading symbols from /usr/lib/libXrandr.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXrandr.so.2
Reading symbols from /usr/lib/libXcursor.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXcursor.so.1
Reading symbols from /usr/lib/libXcomposite.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXcomposite.so.1
Reading symbols from /usr/lib/libXdamage.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXdamage.so.1
Reading symbols from /usr/lib/libXfixes.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXfixes.so.3
Reading symbols from /usr/lib/libgmodule-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgmodule-2.0.so.0
Reading symbols from /lib/tls/i686/cmov/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libdl.so.2
Reading symbols from /usr/lib/libgthread-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgthread-2.0.so.0
Reading symbols from /lib/tls/i686/cmov/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/librt.so.1
Reading symbols from /usr/lib/libstartup-notification-1.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libstartup-notification-1.so.0
Reading symbols from /usr/lib/libgnome-keyring.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnome-keyring.so.0
Reading symbols from /usr/lib/libjpeg.so.62...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libjpeg.so.62
Reading symbols from /usr/lib/libgailutil.so.18...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgailutil.so.18
Reading symbols from /usr/lib/libpangoft2-1.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpangoft2-1.0.so.0
Reading symbols from /usr/lib/libesd.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libesd.so.0
Reading symbols from /usr/lib/libaudiofile.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libaudiofile.so.0
Reading symbols from /usr/lib/libORBitCosNaming-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libORBitCosNaming-2.so.0
Reading symbols from /usr/lib/libdbus-1.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdbus-1.so.3
Reading symbols from /usr/lib/libgnutls.so.13...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgnutls.so.13
Reading symbols from /usr/lib/libavahi-glib.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libavahi-glib.so.1
Reading symbols from /usr/lib/libavahi-common.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libavahi-common.so.3
Reading symbols from /usr/lib/libavahi-client.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libavahi-client.so.3
Reading symbols from /lib/tls/i686/cmov/libresolv.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libresolv.so.2
Reading symbols from /lib/libselinux.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libselinux.so.1
Reading symbols from /lib/tls/i686/cmov/libutil.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libutil.so.1
Reading symbols from /usr/lib/libfreetype.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /usr/lib/libpng12.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpng12.so.0
Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1
Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXdmcp.so.6
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /usr/lib/libexpat.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libexpat.so.1
Reading symbols from /usr/lib/libasound.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libasound.so.2
Reading symbols from /usr/lib/libtasn1.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libtasn1.so.3
Reading symbols from /usr/lib/libgpg-error.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgpg-error.so.0
Reading symbols from /usr/lib/libgcrypt.so.11...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgcrypt.so.11
Reading symbols from /lib/libsepol.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libsepol.so.1
Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2
Reading symbols from /lib/tls/i686/cmov/libnss_nis.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2
Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2
Reading symbols from /usr/lib/gconv/ISO8859-1.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gconv/ISO8859-1.so
Reading symbols from /usr/lib/pango/1.6.0/modules/pango-basic-fc.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/pango/1.6.0/modules/pango-basic-fc.so
Reading symbols from /usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
Reading symbols from /usr/lib/librsvg-2.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/librsvg-2.so.2
Reading symbols from /usr/lib/libgsf-1.so.114...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgsf-1.so.114
Reading symbols from /usr/lib/libcroco-0.6.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libcroco-0.6.so.3
Reading symbols from /lib/libbz2.so.1.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libbz2.so.1.0
Reading symbols from /usr/lib/gtk-2.0/2.10.0/engines/libubuntulooks.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/engines/libubuntulooks.so
Reading symbols from /usr/lib/gnome-vfs-2.0/modules/libfile.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gnome-vfs-2.0/modules/libfile.so
Reading symbols from /lib/libattr.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libattr.so.1
Reading symbols from /lib/libacl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libacl.so.1
Reading symbols from /usr/lib/libfam.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfam.so.0
Reading symbols from /usr/lib/bonobo/monikers/libmoniker_std_2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/bonobo/monikers/libmoniker_std_2.so
Reading symbols from /usr/lib/gnome-panel/libwnck-applet.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gnome-panel/libwnck-applet.so
Reading symbols from /usr/lib/libpanel-applet-2.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpanel-applet-2.so.0
Reading symbols from /usr/lib/liblpint-bonobo.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/liblpint-bonobo.so.0
Reading symbols from /usr/lib/liblaunchpad-integration.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/liblaunchpad-integration.so.0
Reading symbols from /usr/lib/libwnck-1.so.22...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libwnck-1.so.22
Reading symbols from /usr/lib/libXRes.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXRes.so.1
Reading symbols from /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so
Reading symbols from /usr/lib/gnome-panel/libnotification-area-applet.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gnome-panel/libnotification-area-applet.so
Reading symbols from /usr/lib/gnome-panel/libclock-applet.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/gnome-panel/libclock-applet.so
Reading symbols from /usr/lib/libecal-1.2.so.7...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libecal-1.2.so.7
Reading symbols from /usr/lib/libedataserverui-1.2.so.8...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libedataserverui-1.2.so.8
Reading symbols from /usr/lib/libebook-1.2.so.9...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libebook-1.2.so.9
Reading symbols from /usr/lib/libedataserver-1.2.so.9...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libedataserver-1.2.so.9
Reading symbols from /usr/lib/libcamel-1.2.so.10...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libcamel-1.2.so.10
Reading symbols from /usr/lib/libplds4.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libplds4.so.0d
Reading symbols from /usr/lib/libplc4.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libplc4.so.0d
Reading symbols from /usr/lib/libnspr4.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libnspr4.so.0d
Reading symbols from /usr/lib/libdb-4.4.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdb-4.4.so
Reading symbols from /usr/lib/libnss3.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libnss3.so.0d
Reading symbols from /usr/lib/libsmime3.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libsmime3.so.0d
Reading symbols from /usr/lib/libssl3.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libssl3.so.0d
Reading symbols from /usr/lib/libkrb5.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libkrb5.so.3
Reading symbols from /usr/lib/libk5crypto.so.3...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libk5crypto.so.3
Reading symbols from /lib/libcom_err.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libcom_err.so.2
Reading symbols from /usr/lib/libgssapi_krb5.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgssapi_krb5.so.2
Reading symbols from /usr/lib/libsoftokn3.so.0d...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libsoftokn3.so.0d
Reading symbols from /usr/lib/libkrb5support.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libkrb5support.so.0
Reading symbols from /lib/libkeyutils.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libkeyutils.so.1
(no debugging symbols found)
0xffffe410 in __kernel_vsyscall ()
(gdb) continue
Continuing.

Program received signal SIGPIPE, Broken pipe.
[Switching to Thread -1226434896 (LWP 5452)]
0xffffe410 in __kernel_vsyscall ()
(gdb) Hangup detected on fd 0
error detected on stdin
The program is running. Quit anyway (and detach it)? (y or n) EOF [assumed Y]
Detaching from program: /usr/bin/gnome-panel, process 5452

ProblemType: Bug
Architecture: i386
Date: Sun Oct 7 22:16:03 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/gnome-panel
Package: gnome-panel 1:2.20.0.1-0ubuntu5
PackageArchitecture: i386
ProcCmdline: gnome-panel --sm-client-id default1
ProcCwd: /home/tom
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-panel
Uname: Linux laptop 2.6.22-13-generic #1 SMP Thu Oct 4 17:18:44 GMT 2007 i686 GNU/Linux