Good morning. Yesterday was tough day. Sorted out buttons, but while i was doing that, had a lots of different problems. Mach4 itself was crashing a lot of times. Today, turned machine on, and it works first time. So my guess is, Mach4 is using some of the laptops resources, and when insufficient does a crash. Will see how it goes today, as we planning couple of dry runs. Still, thank you for button solution.