When I try to browse Discover on iPhone/iPad, I can't display or play videos.

Playback of content may be unstable when using full-screen display. Try redisplaying the previous image and then displaying the next image once again.

This symptom may occur in certain versions of iOS. Tapping a thumbnail Play button may resolve the issue. Otherwise, try selecting [x] once to pause playback and then tapping the Play button again.