General :: Difference In Settings: Console From Desktop & Ssh As Display Not Set When Ssh In?

Debian Squeeze: Linux jilldando 2.6.32-trunk-486 #1 Sun Jan 10 05:53:18 UTC 2010 i686 GNU/Linux

gdm for desktop manager

I have 4 differences situations, 2 work, 2 do not: So I think my server box (Jill) is messed up.

1) On the server desktop, I can open a console as the gui logged in user and type: xeyes and those eyes appear.echo $DISPLAY :0.0

2) If from that console I log in as another user (ros) and then type:
xeyes I get:

Error: Can't open display:
echo $DISPLAY
(NOTHING)
so that will be a problem.

3) If I ssh into my offices remote server from my XP machine with putty and x-forwarding and then type:
xeyes and those eyes appear.

echo $DISPLAY
localhost:11.0

4) If I ssh into Jill from my XP machine with putty and x-forwarding and then type:
xeyes I get:

Error: Can't open display: echo $DISPLAY (NOTHING)so that will be a problem.

This leads me to think I have something messed up on my Linux box Jill.

I have tried setting DISPLAY= to various values but same error, so this led me to believe something else needs setting. Especially as env yields alot more in situation 1 than in situation 2.

What can I set where, that will allow me run xeyes (anything X) in situations 2 and 4, just like in situation 1 and 3?