Bad login bug (multiplayer) launcher

*New: If you start two times the launcher and login with the same account, the first logged in account won't work for multiplayer, I don't know if this is intended (that people can't steal accounts...) but earlier (before the new launcher, it worked with two opened Minecraft windows.

*Old text:If you used in the laucher a snapshot profile and set let launcher open, open the snapshot version, close it and log in with your normal account (close launcher when starting the game)(1.6.4), at all multiplayer servers you get the message bad login.
If you close minecraft now and start the launcher again and choose instantly your normal profile works well