I use the video post format for some of my posts. With my former theme, videos displayed instead of the feature image. 

Now that I am using Soledad (which is generally ... amazing!), videos only show up on a few of my video post. 

When I try to fix the problem, I edit a post where the video is not showing up. Then I select "video" as the post format. I see my YouTube URL is already there. And then I hit "Update." And my post has reverted back to "Standard" and no video is showing up. 

I have also tried making a brand new video post, but the same thing is happening. 

I tried other custom post formats (gallery) and that also is not working.

Ideas? 

Here is a post where it is working: https://webelongoutside.com/2017/09/video-rugged-mountain/ 

Here is a post where it is not working: https://webelongoutside.com/2018/08/learning-how-to-be-a-better-leader-in-the-mountains/

Thanks for responding! That fixed it!

Glad it was something simple :)