Incase you overlook the new replies to that other thread.
Heres one idea, if you do everything correct, and follow the suggestions given in
this thread, and it still happens again, you might try to check you pc for any tojans, keyloggers, etc. that is assuming that you havent already.. You never know it could be something as simple as your PC being compromised, wouldn't be the first time that has happened to someone.