Unfortunately no matter what I do I still get this error message intermittently.
It generally appears first thing when I begin work with a new g code file (not always though).
The only work around that has any success is to shut down Mach3, reboot the computer, then reload Mach3. Works most of the time (but not always).
It occurs on both my laptop which I use to generate code in the comfort of my office when I simulate my code and on the desktop machine that I use to run my mill.
The strange thing is that once I have made the devil of a thing go away, it remains satisfactory for the rest of the day.
Sometimes when it appears, I get so frustrated I give up for the day and go and do something else. Next day with the same code that failed the day before it behaves like a meek little lamb. Butter wouldn't melt in its mouth!!!
I am convinced that all it needs is an overnight rest.
Chrisjh