Around 10:20 AM EDT, and lasting for less than five minutes, we started to get reports of 503 System Unavailable messages for some FogBugz On Demand accounts. This was due to an erroneous fix that was pushed to one of our servers. The fix was backed out in less than five minutes and will be re-evaluated before retrying.
Most customers are reporting no loss of in-progress edits.
Sorry for any trouble.