I recently registered an account and have been trying to login. I downloaded the lobby and installed, it all seemed to work fine.
When I launch the lobby I am asked if I want to update. If I say no the program closes, if I say yes it downloads the update and asks if I want to repair or remove FAF. Selecting repair, it starts applying the update but about a third of the way through an error message appears saying
"The specified account already exists."
and then the program closes. If I try launch again the same thing happens. I have tried multiple re-installs (following the proper method) but the problem remains.