I'm going to reload Mach 3 current version as a first try. If that doesn't work I'll try an earlier version. I'll let you know how it works out.
Tom S
Reloading Mach 3 fixed the Ref All Home problem. Just realized while I'm writing this that I should have checked to see if the Zero All and the Rex X, Y and Z buttons work. I was so happy that homing was working it slipped my mind.
Thanks for the help guys.
Tom S