Suddenly the soap tablet is not dispensing/dissolving so my dishes are not clean. Help!

Are you sure the water is circulating? Run the DW for a couple of minutes after it fills and then open the door. Lots of water dripping? If not, you could have a bad fill valve, blocked or bad supply solenoid, clogged or bad pump.

Make sure the rack is not in backwards. If it's in backwards the gap to allow the door to open is to the rear of the dishwasher instead of where it should be. Here is a manual: https://dl.dropboxusercontent.com/u/8010163/Kenmore_Ultrawash_Dishwasher.pdf