X11 forwarding does not work as normal user

[Ziying Sherwin]

We installed openssh 3.1p1 on our Solaris 2.8 machine using gcc 2.95.2. During
the installation, we modified ssh_config and sshd_config to enable X11 and
agent forwarding. 

In sshd_config, we changed the following line to read: 

     X11Forwarding yes 

In ssh_config, we changed the following two lines to read:

    ForwardAgent yes
    ForwardX11 yes 

Both files are set to permission readable to all.

The X11 forwarding works fine if we logged as super user, but does not work 
for normal users. What is the problem?

Thanks,
Ziying Sherwin

P.S. I am not on the mailing list, please reply to sherwin at nlm.nih.gov