Well, I finally figured out what the problem is. The 4th Axix stepper driver in my Gecko is bad. I took the X and A axis boards and swapped them out, restarted mach3 and guess what happened? The A motor turned and the X did not. Just to be on the safe side, I tried a different motor on the X axis, no joy... So Gecko Folks, if you are watching, I need a new driver board!
Qualls