Hi,
i have the same issue since the last update and "first image as Post Cover" IS switched on!
https://stackideas.com/forums/images-are-not-shown-in-the-new-version-in-my-site
How did this get resovled? Why dont you post the solution in the posting before locking it?
In addition i switched off all date stamps and still get a date stamp under my blogs.
cheers....