That is what I was expecting, since the crash message refers to a VNC file called vnchooks.dll. Is iCopy the only program that crashes when VNC is on? Anyways, the crash is due to the VNC hook feature which apparently can be disabled in the options, see e.g. https://forum.ultravnc.net/viewtopic.php?f=29&t=30979. I don't really know how VNC works so I'm afraid I can't help you further with this problem.
Dear cnyballer, thank you for reporting this problem. Can you please check if the error appears also when VNC is not running in the background? Also, can you attach the log file created by icopy?
This is definitely not an expected behavior. Please try and delete the iCopy.settings file and try again by changing the path through the settings window.
Now images are not loaded into memory all together, but only when written to stream.
Starting to solve bug
I'm glad that you were able to solve the issue by building it yourself. Anyway, there is no reason for it to use 2 GB of RAM for a 32 page document so I still need to investigate where the memory hog is. Thank you for reporting the issue.