I posted yesterday about a problem that had me tearing my hair out. Well! If all else fails, do something not allowed; I set the pulse widths in Mach3 to 10 microseconds despite the fact that the allowed range is 0 to 5 microseconds. Instantly, it started working correctly!
I suspect anyone who had anyexperience would have recognized that the motors were too loud and figured the problem out in 30 minutes rather than the 30 HOURs I spent.
This potential problem is not mentioned anywhere in the ZTW or Mach3 documentation.