The URL for my cp.html page in question was posted in my original message but here it is again:

cp.html link

My base href is as follows
<BASE HREF="http://www.twinstuff.com/cgi-bin/ubbcgi/"> It is allowing me to enter and make changes in the general settings properly but the other options (forums, styles, update threads, etc.) returns the error code I reprinted above.

thanks.