There was a change made between WordPress3.0 Beta1 and Beta2/RC1 to the way registrations/new users are handled.
This has had a knock on affect for integrated bbPress forums.
Basically, when registering a user via bbPress on a shared database (bbpress uses wp_users) the following error is given:
Email Email is required
The other issue is that Registering via the WordPress side, makes the bbpress role "Inactive (no role)", rahter than the same role as the default WordPress user. This means each new user registering on a WordPress site will not be able to use bbPress forums until manually and one by one made a member/active.
Can someone please point me towards this change in the code, so that we can maybe attempt a bbPress pluign? Because whats going to happen as people update to WP3.0 is that we'll have a host of very unhappy people!!