I bought this unit yesterday, and set it up last night.  The last step after programming is the manual test.  Not only did no food drop for the manual test, but it would not drop at the programmed time.  I could not make one food pebble drop.  I have tried over and over again, reprogrammed about five times and manually tested about ten times, but I cannot get a single bit of food to pass through.  This unit is going back to the store TODAY.