bbPress.org

Start here:

http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Ffreakinasheville.com%2Fforum%2F%3Fnew%3D1

In the process of making your design valid XHTML, I suspect you will find the reason for this problem.

One thing that’s weird right off the bat is you have two div id="main" in the pages that work, but only one in the page that looks messed up. IDs should be unique, so maybe one would be main-page and one would be main-forum, or something, but why is it missing on the page that is messed up?

I think you’re right that it’s an issue with a div.