Hello, I updated my MBP 2015 to High Sierra (I also used beta versions) and had a problem with twice-login screen. First login was for FileVault and used my old password, second was "right" login screen. I decided to turn off FileVault and encrypt disk again. Turning FileVault helped, becuase now I have only one, correct login screen. Unfortunately, I can't encrypt FileVault again because of error: "Authentication server failed to complete the requested operation" No idea what''s wrong. I don't use AD server or something similar (related to other FV issues described on forums). Don't want to make fresh install, because a lot of configuration and everything except FV works fine.