On this site, any post without a featured image specifically set (such as this one) displays the default floral ‘K’ insignia anywhere on the site where a thumbnail is displayed. I looked around the web and none of the solutions I found worked. I eventually figured out that adding the following to my theme’s functions.php file did the trick:/** * Default post thumbnail image. * */ function mk_filter_thumbnail_id( $thumbnail_id, $post = null ) { if ( ! $thumbnail_id ) { $thumbnail_id = 289; //id of default featured image } return $thumbnail_id; } if (! is_admin() ) { //don't do this on admin pages, it sometimes overwrites thumbnails in the back-end view of the media library add_filter( 'post_thumbnail_id', 'mk_filter_thumbnail_id', 20, 5 ); }By the way, I still haven’t grasped what the third and fourth parameters of add_filter() do… I copied them out of a Stack Overflow answer and they worked. WordPress’s whole “filter” functionality is an odd way of calling functions, although I suppose it’s a practical if roundabout way of hooking into existing functions to add your own code modifications. Mike Kupietz , a reluctant scion of the postmodern age, is larger on the inside than the outside: perhaps not a composer, but a producer and arranger of sounds; nor a writer, but an avid writer-down; an occasional author of doggerel; an erstwhile urban hermit; and privately a man of very great ardor. He is, if now resigned to never succeeding at those personal and artistic pursuits he holds most dear, unwavering in his determination to fail at them as entertainingly as possible. He is currently in what he calls the "red bathrobe period" of his life. If you're wondering what all this has to do with FileMaker development or IT consulting: you done taken the wrong turn, this river don't go to Aintry—Mike's professional services are on his San Francisco FileMaker Pro consulting website. View All PostsPost navigationPrevious Post Mosrite/Bakersfield Guitar PicksNext Post“Elvis Is Everywhere”