[fovea1959]

I got hit with the same problem with a roboRIO and PC that had been imaged a couple of time with beta (roboRIO was not a beta one, was one of the AndyMark early deliveries).

What was different this time (besides the versions) was that I had the ethernet cable attached to the roboRIO and a radio (even though I was imaging over the USB). On a hunch, I disconnected the roboRIO from the Ethernet, cycled power on the Ethernet, and the reimage worked.

Don't know if it was coincidence, but if you have the roboRIO connected to the Ethernet, try disconnecting it while imaging.