More than likely then it is a cookie issue. Not sure how Nuke names the cookies. I know you can modify the name of the cookies for your site(forums side) in phpBB Forums, but don't know in Nuke. Myabe they are so similar in Domain name etc. they are conflicting.

You might try using one site in I.E and the other in Netscape or some other browser. Maybe that will work?

mikem