GDM not reading Sessions dir

[Rob Benton <rob.benton@conwaycorp.net>]

I'm using the gdm package from sarge (2.4.4.7-1) that I just updated to 
a few days ago.  For some reason I no longer have my usual sessions to 
choose from on the login screen.  All I see now is:

   Last
   1. Default System Session
   Failsafe Gnome
   Failsafe Terminal

I have been using 2.4.* versions for some time w/o any problems.  I can 
hear an audible beep when gdm starts up which makes me think there's an 
error somewhere but nothing shows up in the log.

Anybody run into this before?