Strange that it’s not catching if it’s a BB_User. That does seem to be the actual class name. Do you want to do some more testing on that? Are users usually instantiated as wp_User if it’s integrated? Or is it just if you set up the current user as bbSync does, from wp, that you get the user as a wp_User object? It’s up to you, if you could check that and arising questions out I’d be grateful as I’m all over the place right now.
Thanks for your post, really! I feel a lot more confident about finding the solution now.