I have a strange behavior in the launcher. The same happens in version 590, but it wasn't this way in previous versions, so I report it here anyway. When I open the launcher, it automatically logs in with my user in the 'Simulate' tab ('Remember' checkbox checked). But I still have to sign in afterwards in 'Profile' and/or 'Purchase' tab, with the same user, the login is independent between tabs. Besides, if I sign in in 'Profile' tab, and afterwards sign in in 'Purchase' tab, the 'Profile' tab logs out automatically.
Good catch -- yes this is a known issue with this unstable build. I am not sure why is would happen in 590.