Build 5329. Was having issues with the touch module stopping when the probe has been triggered. After spending considerable time fault finding the module, it appears that mc.SV_BUFP is undefined. Substituting 4130 for this variable has fixed the issue. From the Mach4 API.H file: #define SV_BUFP                         4130 // last buffered P code value. Has this been left out of the newer versions?