That did occur to me last night. But the diagnostics page shows the probe flashes the Digitze LED and it does not trip an Estop when activated. But even if they were, that does not explain this sequence:
After G31 error, reset DSPMC, restart Mach 3, and hit the Mach 3 Reset button. All is ok. Mach 3 Reset button stays green. The probe going active does not cause an Estop. Only after a G00 or G01 does the Estop trip, and the Reset button flashes. I cannot reset Mach3 until I reboot Mach3. The Estops messages are continuous. The Diagnostics screen does not show the Estop button active.
I cannot get G00 or G01 to work until I reprogram the firmware.
The only plugin I'm using is for the Russian pendant, ShuttleRu (Andrey67 on CNCZone).