I think you will find it is the computer possible the display driver that causes the problem. I have 2 computors here 1 w2000 and 1 vista. The vista dawg has problem with Mach3 and wizards being able to toggle buttons and enter DROs with values. Some work some do not.
The W2000 works ALL the time. Same version Mach3 Same XML.
Just a thought, (;-) TP