We have our developers looking at this issue and will be reporting back here when it's done.
In the meantime it's important to note that everyone's balances are safe...
Seriously! What about the satoshi I tried to withdraw a couple of months back which just vanished out of the blue while I get don't any payment in my account?
All balances have been "restored". Really they never went anywhere, it was simply a bug in our latest codebase that was preventing the balances from being displayed correctly.
If there's a problem we are eager to fix it, so please do not hesitate to submit a ticket on the site or write us here!
Cheers,
Brian