Having problems with both the touch module on Mach 4 as others describe on this forum. Tried all recommendations found. I also tried doing a G31 in the MDI window and get same error -- Can't transition from MDI running to stop. I get each of these to work once in a blue moon. See attached. Is this a PMDX problem or a Mach 4. Ref All Home works well in all axis. I just have been playing with the Z axis in my tests.