Strange Value in DISPLAY variable

Hello all,
in order to access remote Linux machines, I am running X11 on my iMac. For some reason this does not work anymore when connecting (ssh) from a "regular" bash (application Terminal) but it still works when I am accessing from the xterm-bash which was started with X11.
The error message indicates that the X-Server is not reachable.
Comparing the environment of the to bash', showed the culprit:
working: DISPLAY=/tmp/launch-Gu9ioY/:0
not working: DISPLAY=my_hostname:0.0
As far as I remember this was no issue with Tiger. Does anybody know what "/tmp/launch-Gu9ioY/:0" means? I have never seen this as a value for DISPLAY.
What does X11 sets here for DISPLAY?
Thx for your info on that!

X11 is completely rewritten in Leopard. The Leopard X11 sets DISPLAY for you and you should not override that. Edit anything left over from Tiger, such as .bash_profile, that is resetting DISPLAY. In other words, DISPLAY=/tmp/launch-Gu9ioY/:0 is correct; DISPLAY=my_hostname:0.0 is wrong.
Also note that Leopard's X11 will launch automatically when needed. You don't need to pre-launch it. For example, if you type "ssh -X" at the Terminal, X11 will launch.

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