Yes, at one point they issued a warning not update Vizio TV's firmware.
And I agree their forum is a mess and the 2019 Shield is not really handling the HD video formats right.
What I don't get is, I have the 2015 Shield without DV support and it work rather well and the 2019 is a striped down version but build on the same chipset even though they claim it's new. Reports say internally it much the same with added HDR, DV support. You would think this should be a piece of cake building on their past experience. But so not. Sure hope they get it together soon.
Vizio PX75-G1 | Vizio P75-C1 | Denon AVR-X4500H | OPPO UDP-203 | Tivo Bolt+| Nvidia Shield Android TV | Roku Ultra | Apple TV 4k | C =Axiom VP150 |FL/FR =Axiom M60 |SL/SR =Axiom QS8 |TFL/TFR =Bose 161 | TRL/TRR =Bose 161 | Sub =Reaction Audio S-15 500W SEALED SUBWOOFER