I also decreased the horizontal margins on the toolbar buttons and made them wider so that they dont end up looking like the screenshot kloot posted.
I also changed some double buffering settings on the splash screen and made the background of the lobby login page opaque.
I also made the lobby fully disconnect on a logout.
Unfortunately this is a flaw in the server and the protocol, not AFLobby, and you can get this error in tasclient too. The protocol needs an extra command such as "LOGOUT" to prevent this happening, and although it will still happen, about 60% of all occurences stop.you get an 'already logged in' message