Quote Originally Posted by motoxy View Post
Mach 3 running and still no joy.
That's not quite what I meant. I meant if the if mach3 is running with that file open any program can't write to it.

Have you tried saving to a different folder, or if that's not possible and it just defaults to the freemill directory then move freemill to somewhere you definitely have permission such as my documents.

Btw to play with mach3 if you installed the parallel port driver you'll need to disable the Estop. If you tick the active low box for Estop in config->ports and pins->input signals that will invert the input so mach3 'thinks' the Estop is not activated and lets you play...