IIRC, so far neither Denon nor Marantz have a HDMI certication on their products. Would that explain the problem?\n\n\nI din't think so, as it acts the same whether connected to the Marantz 7705 or directly to my new LG 77" OLED TV. Both these units are brand new, and I updated the firmware of both before putting them to use. My son who is a senior software engineer and more expert than me in this area, looked into the problem extensively. He is certain it is the OPPO BDP 85 that is rogue. I suspect Oppo knew they were incompetent and that is why they closed up shop. My legacy Marantz DV 9600 which is 14 years old works just fine. That has no issues at all. I strongly advise against making any purchases of used Oppo equipment on line or otherwise.