Same thing happened to me
There has to be more to the HDMI Playback problem than just Roku. Older recordings playback without issue on my legacy Tablo quad.
In my case, CBS went to OTA 3.0 encryption and my legacy Tablo Quad doesn't comply.
Serial number. X0250042VTP5
Device model. 3820 R2- STREAMING STICK 4K
Device ID. S0J733D2VTP5
Software version 14.0
Troubleshooting
Tablo is working fine on my Android phone app. I have tried uninstalling and reinstalling the Roku app on my Samsung TV And I did a complete reset pressing the button on the Roku stick. Neither solved the issue.
Exact behavior or issue
In Roku I select the tablo app. I can see the live TV channels and shows that I have recorded. I select a TV channel and the screen changes to black with a circle as if it's downloading. Then it flashes right back to the channel directory. The exact same thing happens when I select a recorded show.
I purchased the Roku stick for the single purpose of being able to use tablo.
It sounds like this is a software problem with the Roku stick. Please fix it. I had a Tivo before this. Thought I would give Roku/ Tablo a try. I'm beginning to regret changing devices.
Issue report tracker
Model: 3820R2 - Streaming Stick 4K
Serial number: X0250042VTP5 (S0J733D2VTP5)
Software version: 14.0.4 . build 12230-E6
GC version: 12.7.23
Timestamp: 2024-11-29T22:20:55z
Please use issue ID P5-480-860 to report the current
Thank you and I look forward to hearing back from you
MG