Currently if a file fails to make it to the server when uploaded as a result, then if you try and retrieve that file later on by looking at a result, the server will crash. This is fixed in the next server release ( > 61 ) so that you receive a message that the file is missing, or that the image is corrupted.
Even better might be to warn the user more strongly that the file didn't transfer to the server well. I've uploaded 100s of files without a hitch so I can't imagine why there was only one file that had trouble. On second thought, I think I know ... it was probably that dead NIC card that caused my one computer to send files at 1.5K/s ! I probably halted the transfer. The files were taking like 20 seconds to transfer with that bad NIC card ! Now they transfer in 1/5 second. I'd bet that if a computer froze *WHILE* transferring the file .. this problem could be reproduced. It must be a rare problem ... as it's hard to image the bad timing it would take to freeze a computer in that 1/5sec window.