Sound Issues

[greenskingIV]

Does any one have any problems with sound on CBS shows? Mostly I have trouble on their sports programs. All the sound comes from the left and right speakers and nothing from the center channel. I use to have this same problem with NBC shows but no longer due. Last Saturday trying to watch the Pebble Beach golf tournament was a waste I finaly had to shut off the receiver and use the TV's speakers. I also had a problem saturday night watching 48 Hours Mystery at 9. All the sound from left and right again and no center channel. I even replaced my 10 year old center channel with a new Klipsch..alas same problems.