the hashed passwords on mtgox take a considerable time to crack, and especially if you changed your mybitcoin password already, then there is something fishy going on.
Well, if that is the case I had changed my password before they reacted to the MtGox hack, and I'm pretty sure I can prove it. If they are doing something like this, then I'm sure the authorities, Better Business Bureau, and West Indies press would love to hear about it, especially if it took place across multiple accounts.
So, Mybitcoin.com, are you thieves?
Or is there a more logical explanation?