I will occasionally get the error message: "laser cut and engrave control system 5.3 was not found" I then have to close the software completely and re-setup my design. If I try and save before closing the software after this message appears, when I re-open it, it will not download to the laser. I can't find a reason why it does this. Sometimes they download fine, sometimes they don't. Quite frustrating cause if I am making an adjustment to a file I cut all the time, I have to make that small adjustment over and over until it finally works. Can't count how many hours wasted opening and closing the software.