I tested on 3.4.2 and 3.5.1 version of wordpress. Appears to be a great plugin, but something is broken in 1.1.4. The roles will not save and I cannot access the forum even as an admin.
Sometimes the error below appears, sometimes it reports success after the role update completes, but it never saves any roles. I would say this plugin is broken 'out of the box' in wordpress 3.5.1
Error updating Forum ID XXX. It is likely your roles haven't been updated (WPBB -> Tools -> Refresh Roles)