I contacted Yamaha, and the rep took my info down to be forwarded to the eng. dept. I contacted my local dealer, and the tech guy asked me to go through all possible different combo set up to make sure that it's not the Yammie. It boils down to 3 diff. scenarios. If I run my cable box into the VCR (typical recording setup) and into the receiver for up conversion, some channels flicker on TV. If I bypass the receiver and run the S-video up to the plasma, all channels work fine. If I bypass the VCR by running the cable box into the receiver, all channels work fine. I suppose that it's time to look into Tivo. Can't have my cake and eat it too, I suppose.