My UCB suddenly developed a problem during the "Finding surface" step. I jog to position like I normally do, the bit comes over to the keyboard side and goes down to the touch block then goes to the hole on the oppsite side. It then drops into the hole several more times than normal then goes to the ouside of the UCB and drops down once more then I get the message "Ensure the slide plate is set". The slide plate is in between the two sides of the UCB almost touch the keyboard side. I blew the hole out with air and it seems to be clear but no help. I guess if I knew exactly what the machine was looking for during that step I would know what else to look for. If I put the board directly on the belts everything works normally.