I had my CNC router all working fine until I went away for a week. Came back, booted the PC it ran for about 10 mins then the motherboard died

Anyway reinstalled everything on another PC and it all seemed to be working ok until I ran the same peice of code that I ran before I went away.

It slammed the z axis 16mm further into the work peice (luckily it was MDF)

I re-zero'd the z axis and it did the same thing again...

It seems when Im zero'ing it is changing the x & y on the G54 fixture but zeroing the machine coordinates on the Z, then when the program runs the 16m machine offset for Z appears in the G54???

Any ideas as it was all working fine on the last PC so Im completely confused...

Can you attach your xml and the code you are running.
Hood