You were right. A simple plunging did the job. I've been gone three weeks on vacation and am in the habit of occasionally flushing this not-often used toilet just to make sure it is in working order. I come back and the sucker didn't flush. I have no idea what could have been keeping it from flushing, but that simple plunging did the job. By the way, why is it that people never seem to sterilize their plunger after using it. On vacation, I discovered a very nasty reeking, and it was a soiled plunger someone thought ought to be close at hand. Sheesh, a little Cascade or other good quality dishwasher soap and a small bucket for soaking does a nice job on them. Or is something else better for sanitizing them?