We apologize for this sudden (but necessary!) change - as of today we are limiting the total number of files per user in our submission queue to 10,000.
Submissions over 10,000 will return a HTTP 503 status ("Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.) until the total number of submissions in our queue from that user dips below 10,000.
This change should not impact most of you as most submission backlogs are well below 10,000 per user. Please contact us with any questions or concerns.