Okay, realized I missed something: if I start from scratch, by turning off the computer, along w everything else, boot up mach, start my cnc setup back up, etc, I can then jog all three axes from the jog/tab popup window no problem. It's when I attempt to load any file and then have the machine accept/run code, that it all stops. The most I've gotten (twice outta maybe 50 times) is the z jogging up slightly. Then, invariably the code locks up, and the motors stop moving. Also, alhough not in every instance, the yellow "dwell" LED by the reset LED will turn on and off a couple times. But again, not consistently. The code I've tried running has worked numerous times over this past week. Really, its only til I downloaded this other program that it all came tumbling down. Again, I would be extraordinarily grateful to anyone who could help me with this, since I'm just stumped, honestlty. Thank you so much in advance...