Featured images missing after database restore?

Bluehost says I deleted my WP installation (perhaps inadvertently), which rendered my site a "error est. database" disaster.

So I ask Bluehost to do a system restore, and the third time brought the site back to life.

However images appear ONLY in posts, NOT in the media library (blank icon), AND all my featured images are missing from the actual post.

Is there a way to restore the sanity to my site? Will uploading a WP backup help?