And that is why I now avoid running Mach 3.

My lathe could work flawlessly for a couple months, then it would just do something totally random. Final straw involved a crash which knocked both the spindle and turret out alignment, and wiped out a couple drills in the process.
Since changing to KMotionCNC (Dynomotion's own CNC program for KFlops), the only issues have been operator induced.