I use Mill infrequently and freely admit the problem is surely self induced. I use Turn a lot more often & have fewer problems with it.
I frequently use Jog in the step mode, holding down the ctrl key to invoke it. It'll work as normal for a while but for some unknown reason, I'll press ctrl + an up/down arrow or pg up/pg down key & nothing happens. Once this occurs, regular jog won't work either unless I press the esc key and then it starts working again but as soon as I press ctrl for a step jog it quits. The only way to get it going again is to close/re-open Mach. Also, whenever it's in the ignore mode, MDI commands don't work either. I can type in a command but nothing happens when I press enter.
Another clue is I found is that if I load a program or run a wizard that generates a standard beginning line of code, normal operation returns for a while until whatever I do that pi$$es it off happens. Any ideas?