i was running ver .029 and it did the same thing. i went back to ver .020 to quit killing material. made a post about it but it was pretty much ignored.
somehow when doing a g2 move it turns it into a g3. going to test .031 monday and see if it is still there.

bill

My problem is also solved.
I reinstallid mach 3 and it worked fine.
I also got my velocity an accel a bit down just to be shure