In terms of USB cables, that's exactly what I've done. The only connection of any sort between Stackshot and the camera is the shutter trigger cable.Should this be disconnected? I've just tried that and it still doesn't work!

Have now just tried the system using a Windows laptop, got exactly the ...

I've rebooted the Mac, reinstalled software several times. I should have also mentioned that when the Mac is connected to the camera via USB, Stackshot does not fire the shutter. It will fire if I unplug the connection, but of course I lose Live view.
What else could I try?

Hi,
I'm using Helicon Remote (latest version, on trial) on my Macbook Pro, having just bought a Stackshot. The program will not operate the motor, despite reinstalling the software, and checking connections. I get an error message saying that there is a problem communicating with the stepper motor ...