Hello Alex,
so I did it and it works. You should confirm 2 times, but now is in acceptable status. I was even not try to search for problem inside component setting, I still trust, that this problem come from Facebook.
Thank you very much for help, this topic is solved
//Just to expalin little bit for point nr2 from original post (login to administrator CP in phpBB), If I use Facebook login, I can not access admin CP, but If I use normal login, I can access it
- but for me this is perfect... if I will be logged in FB and somebody will want to login admin CP, even if he know password, is not possible to log in