I get the same issues with a 7D just doesn't take as long for it to error out as it is actually fully auto. Rarely can I get the routine to finish successfully. Meanwhile it just keeps racking up shutter actuations.
5 USB cables were used (3 for Canon & 2 for Nikon) ... also tried different USB ports on my computers just to make sure that it wasn't the USB cables/ports that were causing the problems ... during the coming weekend, I will try and borrow a Canon 7D to test it out with FoCal.Since it already failed on two of your computers, and you got errors like "failed to transfer..." could there be something wrong with the camera or cable? Latest Firmware? Can you try a different cable?
You probably checked all the settings against the manual several times, maybe it is a hardware problem ...
That's a good idea. Process of elimination: two different cameras, two different computers, two different versions of the software, and multiple lenses. Have you tried multiple cables yet?
Ugh... I wish I was there.
I've had a bad USB cable before. It generally worked but would sometimes cause problems. It was a lightweight low quality cable that ended up in the trash with a quickness once I figured out what was going on.