I've been running my PRT120 for almost 3 years using Artcam Pro and AutoCad. Didn't have my endmill high enough and ran it into the edge of my material while attemptiing to jog home after a cutter change. After 6 hours of clearing, cutting, vcarving etc., all I have left to do is cut out these two parts and I have a serious alignment problem. From the home position, the cutting program seems to begin in the right place at the far end of the Y axis (let's say X,0,Y,48). However, upon arrival at the Y,0 position, X has become out of alignment by .1875. I checked for squareness, disconnected the control cables to check for binding and everything seem okay. Has anyone got another idea of what I might have disrupted?