[Klark0]

I disabled registration in bbpress. All users are created when they signup for a blog.

And to fix the other issue with member roles not being set: Drop this in the mu-plugins folder with a .php extension.

function wpmu_bbpress_roles( $user_id )  {

update_usermeta($user_id, 'bb_capabilities', array('member' => true));

return;

}

add_action('wpmu_new_user', 'wpmu_bbpress_roles');