[luci5r]

Guys,

I have a final update - Everything is working perfectly fine. I made one minor adjustment to the code, and for some reason that seems to have solved the final issue. I changed the player name from "MPC-BE" to simply "MPC". I'm not sure why the hyphen would cause any issues, but incidentally it was one of the first things I tried and it just worked. 

All 1080p non ISO media plays in Kodi internal player.
All 1080p ISO media plays in PowerDVD.
All 2160p media with "4K" in filename plays in MPC-BE.

nVidia Control Panel, LAV Filters, MadVR, MPC-BE & Kodi have all been setup using brazen1's instructions in Post #1 & Post #205. 
nVidia drivers are updated to latest 390.65. Minor adjustments updated per brazen1's instructions on Post #359.

Thanks!!