I have checked and have not found a similar problem with a solution.
As far as I can tell the HD I inputs on My Vizio Midel D32h-F0 TV has HDCP rating of 1.4 and is 1080 p X 60. During setup I was given the work around to manually set up for 1080 p. I did so and got an OK Menus and Screen Savers Display fine. Any video I try to play generates the DHCP Error 020.
I followed the suggestions about unplugging etc. No joy. What now?
The first thing to try in this case is a different HDMI cable. Also ensure there's no dust or crud in either the cable connections or the device ports. It doesn't take much.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.