In case it's Gospel Library Online in a web browser where you're seeing the issue – I've also been seeing this for the past couple of weeks, trying to load various chapters or talks. The page loads, then the middle section where the content should show collapses to a 0 pixel height. I finally cleared the ChurchofJesusChrist.org cookies in my browser (Safari on macOS) a few minutes ago, and that fixed it.
Samuel Bradshaw • If you desire to serve God, you are called to the work.