I recently changed to mach4 from mach3. I got everything setup and working yesterday. Today I ran the softlimits plugin and edited a script so that soft limits are enabled when starting mach4. Yesterday z probing worked. Today the motor doesn't move at all when z probing. Even running G31 in the MDI gets no movement. I can jog the machine around with no problem. The indicator light on the Diagnostics Tab is off and if I manually touch the pad to the bit, the light comes on.