Hood is correct. I have my own advanced nesting wizard that we use on a regular basis. The reason is that the nesting wizard (both mine and the built in one) offsets the parts using G92 (or G52, same result), which changes the location of part home (0,0). Fixture offsets would also have the same result. Mach3 displays the locations on the screen correctly when it is generating the toolpath on screen, but when running it does not take the offsets into account. The same is true if you nest different parts - the display quickly looks messed up as the cuts in this case won't line up at all with the original lines in the display. I don't know of any way to correct this, and after investigating it seems impossible short of having the wizard rewrite the file and avoid using offsets entirely. Too much work for me, since it's only a display issue. One of Mach3's few bugs that can't be worked around, but I haven't mentioned it as I'm hoping Mach4 might correct it. I didn't want to bug Brian with such a trivial matter - I want him to focus on Mach4 because I'm just dying to have all the power and control he keeps teasing us with!
Hope this clears things up.
Chris