I can access live programming, fine. But all of my recorded shows will not play. When I click on their icon, it takes me back to the library. I have tried unplugging the Roku and restarting. I have tried deleting the Tablo app and reinstalling. I am easily able to access the recorded shows on my other devices (iPad, phone, etc.).
Roku model is 4670X – Roku ultra
Software version is 14.0
Sorry to hear you’re running into that.
The issue you’re encountering sounds very much like the Roku 14 problem, though that involves over-the-air channels failing as well.
In that regard, if you would, try the workaround outlined here: Roku OS 14 Update - OTA Player Issue and Workaround – Tablo and let us know the result.
Dolby Digital Plus worked for me. Thank you. 
I tried both workarounds, and neither worked.
On my Roku, I chose Dolby digital and it didn’t work. Then I went back and tried Dolby Digital Plus and that seems to have fixed it.
That’s great to hear!