Pro Sites and bbPress subforum problem

Hi all,

I have something strange going on. I have a site running bbPress forums and integrated Pro Sites. Everything is working fine. Except for one thing. I just noticed that any subforums I created within bbPress giving a 404 error. When I disable Pro Sites the subforums works fine. And re-enable Pro Sites gives the 404 again.

Does anybody have this problem as well?

Cheers!
Justin