Can u please tell me, why AUP ask me sync users, and when I do so, AUP tells me, that sync was succsessful but still ask me do it again and again?

PS There was mass user delete by one of joomla plugin. Is it important?

PPS Version of AUP is 1.5.13 on J1.5

Okay, Here my try to fix it.

I've check, that count count(*) FROM #__users and count(*) FROM #__alpha_userpoints are eqal . BUT in function _needsync there is check: count of aupusers must be +1 user (some kind a "GUEST"). Then Ive look at install script and try to add that "ghost' user named GUEST to #__alpha_userpoints. Message now dissapeared.

Was my actions right?

It's ok. how did you installed the component? Because normally installed right directly with the install script.

Yes, I normal installed component. And it worked perfect. But then I've installed kunena, and some plug-in to kill old users... and then was couple times to sync and kill old users an so on... and after that count(*) FROM #__users and count(*) FROM #__alpha_userpoints was equal and message shown.