M4 seems broken in both Axis and Probe Basic. I was suspecting the UI since MDI and manual GUI buttons don't work, so wrote a short gcode program to turn the spindle on and off. M3 commands work fine, but M4 is still dead.
Make a new config, somewhere there is a choice something like " use negative voltage for spindle reverse" or similar.
Just a stab in the dark, not near a PC right now.
