In case this happens to anyone else, find the login.cfg file inside the settings folder and open it with notepad. The lines are thus:
1st line: User name, usually not your game ID
2nd line: Password
3rd line: I suppose this line is for a flag set by the new proceedure
If you enter the endless loop, you'll need to edit the cfg file with your login data on line 1 and 2.
Oh, and I like breaking things