Yes your are right about it, if your account is linked with Facebook, you don't really need to log in every time you enter the game it take you straight to where you were last time in the game, for me it only happened yesterday when I open game it said I'm not logged in, when i tried to log in it won't let me, not with mod, and not with original, it was almost the whole day yesterday but at night I finally log in, it seemed like Facebook error.