I've done a reinstallation of Mach3 on a mill and am slowly getting everything back to an operational condition (and when I'm done I've got to save the settings so I don't have to go through this again).  Anyway, I can manually jog the x,y,z axes using the buttons on the jog tab menu and the x,z work with the keyboard arrow keys, but the z doesn't respond to the +,- keys.  In every other way, the z seems to respond find.  Any ideas?

Thanks, Glenn

Under config System hot keys You can define the Z axes key .

That is strange, I found the same after I installed a fresh instance but I chose to ignore it for the time being until I resolve the major issues I'm having with my confounded Spindle motor. 

Great, that did it.  When I opened the hot keys dialog it disabled the x,y keys though, but I was easily able to put them back in.
Thanks.