I had the same problem once I got my LFS license. I created a new password for the game login part but, in the game you don't have the choice to change it. I had to go back to the LFS site and change the password to what I had it setup for when I had the sim in demo mode. They should fix this so that there is a login/out option in the game so we can login with a different password. From what I understand, it's permanent.