Thanks WH that makes me feel better. I was initially going to suggest as the first fix to try, going back and carefully reading the instructions for calibrating. The calibration procedure is extremely easy, but there are some things you have to do just right and in the proper sequence, or it won't work and you have to try again from the beginning. I did not mention this thought, because I feel that your cracker does have cheese on it and your elevator does go clear to the top, and I did not want to insult you. Anyways, good news, and I hope it doesn't happen again, or if it does it is merely operator error.