This error occurs when I try and make two separate Minecraft windows and click logout (on the second window). On the first window, it just gives me the "Try restarting your game" message. When I try and start up the launcher again, the bug happens. Yes, I am using Forge (for shaders), but I have deleted the Forge files before and the bug continues. Plus, it is not an issue regarding Forge, but the launcher, so Forge would have nothing to do with that. This is the second time it has happened to me, so it is consistent.

Bug Video: http://youtu.be/wLJ4Kl2tWH0