cvsup + portupgrade Now no Gnome login

[stan]

I cvsup'd today (main and ports), then did a portupgrade -aRR, and now I
can't get loged intot a session using gdm.

I've rebooted the machine, and blown awa ~/.g[cn]* in my user home
directory. Still no luck. I tried the "Gnome failsafe" session, still no
luck. Looks like it doesn't even _try_ to start Gnome, and I get a console
message about 

 gdm_slave_session_start: Execution of PostLogin script returned > 0. Aborting.


What can I do to fix this?

BTW it looks like this upgraded me from Gnome 2.2 to 2.4. Is there a
conversion step I missed?
-- 
"They that would give up essential liberty for temporary safety deserve
neither liberty nor safety."
						-- Benjamin Franklin