Unable to switch session from GDM

["Damodharan R" <rdamodharan@gmail.com>]

Hi,
I am using Debain Unstable.  I have a problem with GDM. It always starts GNOME no matter what other session I choose. I tried to change the session to KDE using the session menu provided in GDM during login. But invariably I end up in GNOME. 

GDM Version
ii  gdm                       2.16.4-1                  GNOME Display Manager

damu@kanini:~$ ls /usr/share/xsessions/
Beryl.desktop  gnome.desktop  kde.desktop  lg.desktop

All these four are showing up in the menu. I had a look at the /etc/gdm/gdm.conf. But it has empty sections! Please help me to get this session stuff working.

Thank you
Damodharan