I almost think I'm seeing this, too. Has anyone mentioned this on the Yahoo group? Brian doesn't read here, I don't think. I'm going to go back to 037 today and see what I can learn. The chargepump led on the diag screen is off sometimes, and I can't jog, but my PMDX-126 outputs pulses as indicated by ITS LED and the Mach DRO is still showing movement, but the machine isn't moving. Hitting reset a couple times seems to sometimes fix it. It's never happened in a program, just when jogging or setting up. I can't pin it down.