I had this exact problem with a couple of Gawker feeds (specifically Lifehacker) in my TTRSS (Tiny Tiny RSS) reader: Pictures not shown in some feeds with figure block. The solution was simple, add the tag to the allowed_elements array in include/functions2.php file and everything started working again. It just broke a month or so ago, so they changed something in their CMS... Someone also released a fix on Git: ttrss-fix_gawker_embeds.