Question answered, thanks, thread shut.

Had this happen to me a while back. Fortunately it was on a minor account as the e-mail address I was using is now defunct so couldn't reset the password. I have no chance of ever getting the game back which I guess is bad news for you guys and not exactly what you want to hear.

I think it was because the password requirements changed to require at least one capital letter which my old passwords didn't have.