Figured it out, it's a cookie issue and one I've come across with some of the other forums I host.
Basically I had bookmarked "www.forgottenprophets.com" but the domain name is setup in the forums admin panel is most likely "forgottenprophets.com" and I make that assumption based on what I see in my browser address bar when I click on the banner at the top of the forums. The lack of www. in the forum settings seems to wreak havoc on the cookies of people who have the www. bookmarked.
I used to come across this when I had secondary domain names setup, like http://forums.windsoffury.net that pointed to http://www.windsoffury.net/index.php.