Hi Steve,
Thanks for the feedback.
I don't have encoders enabled in the HiCON plugin. I set the encoders to undefined from the start, and also tried setting to StepGen after reading through some HiCON manuals - no difference.
I've just checked the ScreenScript, and there is no reference to either of those functions anywhere.
I updated the firmware, FPGA and plugins this morning, and restarted everything.... no difference. I also noticed that if I click on the values in the Current Position DRO on the Diagnostics screen, the values change... usually increasing by 15 or 20 units.
I've also tried running Mach4 on two difference PCs, but have the same problem on both.
I don't have any errors when moving, so I have no idea where to go next....
Thanks again for your time.
David.