Thanks, Skink. I'll try taking the water temp and I'll use the vinegar trick, too. I don't think my housekeeper tinkered with the controls on the dishwasher. I'm the only one who ever runs it. She sometimes puts a dish or two in there, but she never turns it on. It may well simply be that the hard water and time have worn out the dishwasher and it's time for a new one. Thanks for your help and patience in trying to help me diagnose the problem!