Adding to the pile here, my TCL Roku TV is nearly useless right now, the only way I can use it is to cast to the Chromecast built into the TV. @RokuDanny-R this really is one of the worst software updates I have ever run across for something I use every day. Here is my info:
TV is wired via ethernet to a Netgear Orbi AC4200 router, connected to a full gigabit fiber optic connection. Network test is successful 100% of the time, showing perfectly good download speed (over 86 Mbps). I have rebooted my router and the TV and nothing changes. I also tried switching to wireless internet on the TV and that made no difference.
Apps I tested:
Disney+ - not working, Error code 42
Plex - yes but very slow to load
Youtube TV - yes but VERY slow to load both the app and the TV guide (images don't show for many seconds)
Hulu - no - network error
HBO Max - loaded slowly, tried to watch Dune in 4k, won't play
Amazon Prime Video - very slow to load - then internet connectivity error
Netflix - yes loads the fastest of all the apps and seems to be working
System update was run before these tests so all apps are up to date. The app update process is also painfully slow now.
The other strange issue is now the volume of the TV is much lower. It's connected to a Sonos Amp via HDMI ARC and since the 10.5 update I have to turn my Sonos up much louder to get the same volume level as before the upgrade.
I am able to easily and successfully cast all channels from my tablet to the TV's built in Chromecast in 4k/Dolby Vision.
Issue report tracker:
Model: 7120X - Roku TV
Serial number: YS00H9072143 (Device ID: FV28AH072143)
Software Version: 10.5.0 build 4201-30
Issue ID 43-462-230