D E E P   C O L O R .

After some mysterious troubleshooting* with Tony at Yamaha, he led me to see that the problem only occurred when the receiver was connected to my LGTV. I carry around a 13" TV with HDMI inputs for CCTV camera work and other monitoring, and the Yamaha receiver worked PERFECTLY with that.

So I had to look at the TV settings and turned off Deep Color. You know, just like the folks at remotecentral warn you about! It's a new TV and I had naively turned on Deep Color. It was quite a shock to turn off a detail of the way the image is shown, and then have the sound come on!

*After being on hold for about 90 minutes while they worked their way through twenty other installers on hold