Aidan Kehoe <kehoea@parhasard.net> writes:

>  > If they have read access to said .Xauthority file, yes.
>
> This person didn't.

Oops.  I didn't notice that you've got a zero length .Xauthority.

>  > > 9:48PM ~ > ls -l ~aidan/.Xauthority
>  > > -rw-------  1 aidan  wheel  0 May  5 20:20 /home/aidan/.Xauthority

Something wrong with your /usr/X11R6/lib/X11/xdm/xdm-config, perhaps?
There should be a "DisplayManager._0.authorize: true" in there for
your primary display, for instance.

-tih
-- 
Tom Ivar Helbekkmo, Senior System Administrator, EUnet Norway
www.eunet.no  T: +47-22092958 M: +47-93013940 F: +47-22092901