Well, the electric gremlins have been scared away I guess. With generator off and shore power disconnected, I moved the generator breaker back and forth several times. Cranked up the generator and let it get up to speed, waited 30 secs, and now the plugs are working. Haven't a clue why, but all is well.
Many thanks to all for the suggestions. If nothing else, I'm now very familiar regarding the wiring!