Have there been cases of traditional money theft from Bitcoin exchanges? There have been a number of cases of thefts or losses of Bitcoins from a few Bitocoin exchanges, but has there ever been a case of traditional currency being stolen or lost by an exchange?
This much less likely for a number of reasons:


Banks have advanced, robust and well-tested anti-fraud infrastructure, making such thefts much more likely to be detected.
Legally it is much much easier to prosecute for fraud cases in fiat than BTC (I do not know any prosecution over stolen Bitcoins)
Fiat transactions are reversible meaning the exchange could easily get its money back
Bitcoins are much easier to launder, so thieves are less likely to get caught