4
my problem was about the unstablity in the profile module after i set a negative number somewhere.
i solve it by delete some extra rows in database
anyway for those want to synchronize users in 2.2+ i wrote a little php and can download here:
just upload to modules/profile/admin/sync.php and of course you must use it with a DIRECT link.(no menu/link in admin page)
http://www.farsixoops.com/modules/newbb/viewtopic.php?viewmode=flat&topic_id=593&forum=30