I believe one can have issues with anything. I have had no issues with the MPG. HOWEVER i have noted that sometimes i move it and nothing happens but what i have found is that just be sure that the cnc software i.e. NCStudio is the active window - which is not necessarily the top window. SO what i found works is to click in the window OR do a manual jog WITH the MOUSE then the MPG has no issues. Touch wood no problems thus far.