Went from Mach3 D1.90.070 to V2.0.012, I just mentioned Mach2 cuz I was also having problems then. Only does it once in a while. Like I said I single blocked it twice (with D 1.9) and about 5 or 6 times after and it worked perfectly all other times.. It's frustrating because Brian said this was fixed in V2, and now I'm having more problems than ever