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I have been using Corel 12 with Signtools3(Asigns from Australia)bridge program, cutting sandblast stencil and vinyl with my desktop winXP, usb to serial cable, for 6 or more years. I recently upgraded to Win 7 and Signtools 3 won't run on Win 7 so, I ordered a new copy of Signtools 4 and Corelx4, not here yet. Win 7 apparently doesn't like some parts of Corel 12, but I don't know. I tried to cut a stencil today and the cutter would cut a few patterns right then it would do a crazy x-y runaway thing, drawing straight lines connecting other characters across the drawing. I assume it's a driver problem. I had to download the driver from this site because the computer wouldn't recognize any port for the Refine MH721 Any suggestion other than selling this piece of crap plotter?

I cut 45-48 mil heavy rubber sandblast stencil(anchor with yellow mylar liner) for monument deathdates. I use Windows XP, Corel12 with SignTools 3 bridge program, Refine MH-721 plotter 60-degree knife,4-8 speed, 360-380 pressure. I get distorted letters, such as the bottom curves in the "U", the outer curve of the "R" and the number "8" where it crosses. The tops and bottoms of serifs are slightly slanted. I'm thinking this is a friction drive problems, but the corners or the lettering does not cut cleanly. There are always little crumbs of rubber in the corners. I have the latest drivers installed. I had a P-Cut 630 that worked a little better, but the LCD malfunctioned. I sent it to Montreal for repair a couple of years ago and they could find nothing wrong with it, but have never returned it, so I bought a Refine. Any thoughts?