Patricia, I just bought my Juki QVP2000 six weeks ago, and during a quilting retreat the sensor apparently wouldn't let me go back to the wider hole on the plate, so I only had the five stitches that the motherboard will allow with the sensor on. I searched and found that you had the same problem too. Did you get it resolved, hopefully easily? I tried unplugging the machine hoping that the program would reset. I did see that little black spring on the back of the plate, and I haven't been switching it back and forth much since I do mostly piecing on the machine. Thanks for any help you can give me!