[Bug 34496] error when switching between gnome & Xfce

[kuyaedz]

Public bug reported:
https://launchpad.net/malone/bugs/34496

Affects: gdm (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I installed the xubuntu-desktop package after doing a clean install of
Dapper (gnome).  I notice if I change the session type to Xfce, logout &
log back into gnome I recieve the error:

"I have detected a panel already running and will now exit"

at this point the gnome-panel & gnome-desktop do not load & I am forced
to ctrl-alt-backspace to exit.  I must reboot in order to gain access to
gnome again.