Well, today I finished a WU that took about 30 hours to complete - ("ProteinA") - and it was sitting around waiting for me to get on the net when I arrived ("attempting to send results" or some such). So I tried that, and after a few failed attempts got on. It kept attempting, and then seemed to have succeeded. It got a new WU, but didn't increment my completed WU count, and as far as I can tell whatever I sent, if anything, disappeared into the ether.
It would be good if they'd publish the source code for this thing so we could get a look at it and, perhaps, improve it.