Hi Clive. I.ve just encountered today a very suspicious thing, which makes me think the issue is in the pc, or pc setup thing. Running drivertest.exe in mach3 folder, I get mostly a flat line, system excellent message and some pulsing to fast and pulsing to slow sometimes. But running the same exe, and having the mach3 open, and simply moving the mach3 window on the desktop, without pressing anything, the drivertest.exe goes wild, huge spikes all over, and always displays pulsing to slow. As soon as you stop moving the window, it.s returning to normal.
You can see in this video what I.m talking about. Sorry I did not hold the camera still.
https://www.youtube.com/watch?v=zFY8...ature=youtu.be

Also here it is the exact behaviour of the cnc. Please skip at minute 1.05 to see the issue.
https://www.youtube.com/watch?v=KWlV...ature=youtu.be

In device manager, under My Computer it says ACPI x32. There are some articles that say I should change that to Standard Pc. I don.t have this option, so I guess I should reinstall windows. Others say that changing that creates problems and windows might not load anymore.
I.m a bit confused about all this but I.m strongly inclining to believe that here lies the source of all my problems.