I'm sure you've probably already been contacted about this, but a website named mybitcoin.com was apparently operating on your service. The site's IP was 83.149.112.133
Essentially, this site has closed up shop for some reason, and is holding thousands of dollars' worth of bitcoins hostage. A check on accounts reveals the operator has not raided the accounts, so it's possible he has been hospitalized or died, or for some other reason is totally neglecting his very popular website. Search the forum at http://bitcointalk.org for mybitcoin and you will find several threads discussing this. Here's one: https://bitcointalksearch.org/topic/mybitcoin-leaseweb-proposal-33571
People are wondering, as you can see in the above thread, if the mybitcoin account has been turned off for non-payment and or has crashed and the operator is possibly hospitalized and does not know. Personally, I have over $500 USD in bitcoins in an account there and would certainly be willing to chip in to get his account turned back on or have the server rebooted so we can all get back in and get the money that we put there.
I would appreciate hearing good news from you, thanks!
Ian Freeman
Host, "Free Talk Live"