It has happened three times while I have been working tonight. There were a couple of Hyper-V thumbnails open on my computer when I checked however there were not on the other workstations.
Unfortunately, I don't have much more to go on than the event log error. The only thing I have had open tonight inside VNC Manager are VNC connections. Nothing out of the ordinary. Just basic remote control. No file transfers or anything like that. I've been playing around with it and have not found anything specific to trigger the crash.
We did not have this problem before the upgrade. I did try a patched version of the DLL from http://support.microsoft.com/kb/2734410
however the problem remains.
I'm more than willing to try / test anything I can.