We're experiencing some server problems this afternoon (December 12th) that may result in you getting an email that contains the above not terribly helpful message 4 hours after you upload some photos. We're working on it! Will post updates on this thread.
We believe we've dealt with the problem that may have lead to perhaps 10-20 synths apparently "processing" for 4 hours, then failing with the "oops" message. Please add to this thread if this happens to you.