It's amazing that an account under 2FA in Mt.gox can be hacked. This guy found his money withdrawn on May 31, 2013. Someone changed his password and cancelled all 2FA in Security Center. He says he didn't use his mobile phone to get on Mt.gox. How did the hacker get his private key of 2FA?? I don't know whether there is someone experience the same.
It's so terrible which means the 2FA maybe not safe.

Link to this post:https://bitcointalk.org/index.php?topic=221098.0