Ok, I got a new 721-MK2 Us Cutter and it came with Sure Cuts a Lot Pro. From what I can find out, SCAL doesn't tile, so I downloaded SignBlazer to tile my larger jobs. Tile #1 cuts fine, but when I proceed to tile #2, the cutter has a meltdown. It cuts correctly for about 10 seconds, then it just veers off course and runs the entire roll of vinyl out the front while making a cut down the middle. Any thoughts would be appreciated. Thanks!