Hackers compromised the company's servers and completely emptied out its online wallet.
Drew Bowling
2012-05-14
http://www.webpronews.com/bitcoin-theft-drains-92000-from-bitcoinica-2012-05
...
While a Bitcoin theft like this should be expected at this stage of the online currency’s lifespan, it looks particularly bad for Bitcoinica because this is the second time in less than three months that the company has been hacked.
It’s unfortunate that Bitcoinica fell prey to hackers not only twice but twice within a relatively short amount of time. Such security breaches aren’t really doing the Bitcoin network in favors insofar fostering consumer confidence in the currency.
...