I am on Rivervale, which means that it isn't actually preventing me from playing, but why would that pop up saying i should become a member?
Think you are an "old" LifeTimeMember. Players from DUCO LifeTime always had Problems with the notification. E.g. the notification of the date when the 500 monthly DBC are given does not work, but when you reach the date it gives the DBC. This seems to be the same problem
They probably fixed something that re-broke the lifetime member hack...er, fix. They have had this problem before, and hopefully they can fix it before the expansion goes live.