Can anyone help? when i'm running a proven good program if i change from the "program run" screen to the "toolpath" screen some how the x and y axis will either gain or loose anywhere from .005 to .010 it only happens when switching views. i'm running a desktop pc with windows xp. i know the easiest solution is "if it screws up when i do that, just don't do that." , but it would be nice to view other screens when the program runs. thanks in advance for any help.

When you say that change their value, does this affect the toolpath result or is it just a rounding issue on the dros?
What happens if you return to the run screen? The values remain changed or they return to the previous values?

Get a faster PC.

 Mine misses steps when I change screens too, so I don't change screens.

when i change screens it actually changes the toolpath. if it just changed the values i probably wouldn't have noticed. i'm not sure but i think it changes a little each time i change screens.  does anyone know of a fix?

thanks ger21, will a faster pc do the trick? i missed that when reading your reply the first time.

You should not really change screens when code is running even with a fast PC, this is the due to the way the graphics are drawn in Mach. Rev4 of Mach which will be released at some point is totally different and you will not have this problem but until then just dont change screens when code is running.
Hood