This was mentioned some time earlier but there wasn’t a clear answer to the problem, when I take dark frames with my Nikon D600, the frames are actually light frames, I am using the original USB cable and have tried in different computers and I have also updated to the latest version, I have also selected the camera model from the camera setup. I can remember that this was possible on an earlier version, but can’t remember if I was still using my D5000.
Oscar