You need to add more details on your config, it could help.by the way I think...

You need to add more details on your config, it could help.
by the way I think you're having troubles with forwarding related to X forwarding on the ssh tunnel or X without ssh.
You need to modify some configs, see my blogs on ssh, X and port forwarding.
Even if you're a Mac "cousin" you'll have the same settings for ssh
take a look at:
http://www.linux.com/community/blogs/ssh-scp-without-password-to-remote-...

http://www.linux.com/community/blogs/Remote-port-tunnelling-with-SSH.htm...

http://www.linux.com/community/blogs/SSH-Tunnel-between-two-machines.htm...
and part two:
http://www.linux.com/community/blogs/SSH-Tunnel-between-two-machines-par...

But mostly:
http://www.linux.com/community/blogs/Forwarding-X11-Apps-through-SSH.htm...

I think you're not forwarding X that is locked by default

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