To be completely honest, it's highly unlikely that we have lost a single dollar here.
The fiat currency is all in "confirmed" status withdrawals, and all the BTC have been withdrawn before the event.

But still, it's possible that this account has been compromised. And i think there was an open balance of a few hundreds (nothing that we would care about, but better than nothing for a polish attacker).
If it has been compromised, it is quite an interesting attack, since it implies getting your hands on MtGox database (at least the user ID or emails list) and being able to sniff their servers traffic in their Florida colocation.


I'm reposting a message from another user who apparently had the same issue today: https://bitcointalk.org/index.php?topic=255644.0