Thx Brad. Mac Mini is not running in 4k. It is quite old. The Sony Bluray is fairly new and is 4k.

I'm leaning a bit more to the TV being the issue? The theory being, the OSD is injected onto the TV via the Video Out cable going from the receiver. Also, the OSD is only providing info from the receiver. Volume, mute, input, sound field, speaker settings, etc.

I've messed with all of the video settings on the Sony XBR, with no success. I am wondering if after I make one adjustment to a TV setting, I should power off the TV and devices and let them re-sync to see if it had any effect before experimenting with the next setting?

Are you thinking the receiver is not capable of doing this, in 4k HDR? It's working with the Sony 4k Bluray. Not certain if it is HDR?? I'll try changing the settings on the ATV to 1080i or p and restarting everything.

Thx Dave