Hey miners,
We've resolved our issue, and are now generating work properly again. If you switched to a backup pool during the downtime, you can now switch back.
No accepted shares were lost, and we are paying full value for these shares done on the malformed work we were sending out earlier today: it was our bug, not your problem. The bug has been fixed, and we're now generating valid work again.
Thank you for your patience, and our apologies for the inconvenience!
Chris