I'm reporting this here because some people have had issues with user role editing and the latest version of the BBpress 2.2+
My BBPress died on version 2.2.3. There was some issue with editing of user roles that causes 404 errors when viewing threads. There has been a lot of discussion on the BBpress forums and conflicts with plugins that edit user roles. http://bbpress.org/forums/topic/bbpress-2-2-all-forums-now-return-page-not-found/
Right now there is no fix, but one of the Member plugins has implemented something. It's beyond anything I understand, but maybe you have some insight into it.