Tv app not playing downloaded video

My iPad automatically updated to iOS 11 and now when I go to the TV app, tv episodes I downloaded from iTunes will not play. They are visible in the app, and when I click on the episode title I get the usual small box with a white play button pop up, but when I click on it, the box just closes. It does not start the video.

I’ve rebooted the iPad. I’ve deleted and reinstalled the tv app. I downloaded the episode again. Same result: everything looks like it’s ready to play, but I can’t get it to do so.