As you are aware, Jim, the dishwasher tablet is dissolved by the water flowing across it. So, a few things to consider. Are there any blockages in the spray arms, causing a loss of water flow? Is the washing water reaching the correct temperature? (Loads of steam when you open the door immediately the wash cycle has finished). Can you hear the release door opening when the machine is on - and can you ascertain that it is opening at the correct time - ie not too late in the cycle?
John, July 2009