My Plex system is perfect, including Chromecast, except with the Tablo channel. The failures are a mix, but always a fail. Failures seem to randomly pick between:
1. Video but no sound
2. "Cannot play this video"
3. Three seconds of play, then bails out.
4. No response at all
I have the lastest Plex server on a fresh ubunto OS. Live and recorded OTA TV is why I wanted the Tablo. If all I can play is downloaded stuff, I don't need it. Everyone has bitched for years about no OTA solution for Plex, now you provide it, but if it doesn't actually work, you have missed a huge opportunity.