post thumbnails don't show up now

Hi there

My journal used to show up with automatic thumbnails that were set to the featured image, and now that I’ve added a video as the featured image for that post, that post no longer has a thumbnail.

You can see my page at http://www.lightscience.ca/journal

I saw that it automatically made a featured image generated from the youtube video thumb…. which is great, I really want that thumbnail to show up as the thumbnail for that post.

How do I fix it?

Thanks

https://wordpress.org/plugins/featured-video-plus/