Beautiful, found under machine.ini for my profile, corrected it and up comes the display, thanks very much.
The LED works fine and in the display it goes blue when the I touch the pad on the probe. But when I select Z axis probe, Mach4 Enable button goes green instantly, and then it hangs for any further commands given. So if I try to enable again, it goes red but that's it. "Program not responding" and I need to reboot the PC because windows says an instance of the program is still running (after END program seems to have closed.
This has to work, doesn't it? If Mach4 is getting the signals, its just the operator that needs counselling...