Hey. I was having the problem where new registrations to BB was giving the users administrator privileges (bu the default was set to subscriber) -- and In the WP userlist, the new bb users were sort of ominously listed below the users who registered through WP.
I saw this mentioned a few times here (sorry for not just adding this in reply to one of those posts, I couldn't find them)...
Anyways - I realized I have the Role Manager plugin installed in WP.. I de-activated it, and now new users get assigned the proper default WP role.
Cheers.