Ok. I have not tried it with CB Login.
Beacuse using 'register' with CB Login causes an error message:
Fatal error: Call to undefined method stdClass::getPublicProperties() in /home/maythil/public_html/mambo/includes/database.php on line 550
(note: the site name is:
www.maythil.ws).
Registration using the regular login (mod_login) works well, though.