BuddyPress.org

@Russell:

HOWEVER…

I lose the forums function in BuddyPress groups

Remember you also need the XMLRPC call in your bb-config.php as well for group forums.

$bb->bb_xmlrpc_allow_user_switching = true;

(goes right before ?> in bb-config.php)

Do this again and make sure you have the XMLRPC line in bb-config.php