Roku 4 - Guide works, can't watch channel

I just set up my Roku4. The guide in the Tablo app fires right up and everything seems to look just fine. When I actually select a show to watch, it gives me the ‘Loading’ message for about 15 seconds, and then goes back to the guide. What’s causing this?

Which Roku channel? The Preview?

Yep, it’s the Preview channel. My Tablo is on 2.2.2. It’s now hit and miss, sometimes it loads the station, sometimes it doesn’t. I didn’t have this issue on the Roku3.

xxxx cccc xx cc