The 3dprobing was automatic in older versions of Mach. You select center of hole it gave you directions of positioning the probe in the hole once you push start it would go in 4 directions then to center of the hole . A box would open telling you you were in the center. You could then zero your X and Y for reference or what ever.
 Seems to be alot of problems with probing they need to develope a new version that works since it was available in older versions, not just take it out.