problem: hoary, after update no gdm login ..

[kloschi at subsignal dot org]

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After updating alot of stuff today, its no longer possible
to login to X.
All users get "session was shorter than 10 secs ..", with an
.xsession-errors:
/etc/gdm/PreSession/Default: Registering your Session with wtmp and utmp
/etc/gdm/PreSession/Default: Running: /usr/bin/x11/sessreg -a -w 
/var/log/wtmp \
- -u /var/run/utmp -x "/var/lib/gdm/:0.XServers" -h "" -l ":0" "kloschi"
/etc/gdm/XSession: beginning session setup ...
SESSION_MANAGER=local/ira:/tmp/.ICE-unix/4669


and nothing more.
I have no clue what causes this or how to debug, bedause no log says 
anything.
Any Ideas?
I'd need that machine up and running asap : /


thanx for helping.
k.


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