The problem actually started for me when I upgraded from CBSubs RC2 to 2.0.1. Administrators could no longer add new users. "You cannot save a `Registered`. Only higher-level users have this power."
Yeah, I've noticed this 'solution', also noticed, that it's possible for non super-users to create user firstly through joomla user manager, and then finish edit them via CB, but it's not solution either. Do not have such issue on j1.5.26, but have on 2.5.4