Originally Posted by TrudyM
I am sure you checked this but just in case. The water fills in the tank at two spots one at the base of the mechinism the other is a little tube attached by a clip to the overflow tube that sprays down the tube into the bowl as the tank fills. If it gets knocked so it isn't spraying down the tube the water level in the bowl will be low.
Trudy, never be sure of anything! I had looked very carefully for ways to adjust the mechanism, but, in focusing on that, I failed to see that the tube going into the overflow valve had come loose and was just discharging into the tank. Problem solved. Thanks!