The best part about this page was when my WordPress media library broke while I was trying to upload the update. Apparently WP 3.8.1 and the AJAX Rebuild Thumbnails plugin don’t get along so hot and will throw a super helpful error: An error occurred in the upload. I rebuilt the meta data first, then tried to rebuild thumbnails using AJAX since I already had that installed. No dice! More searching revealed that AJAX has a conflict with WP 3.8.1 so I deactivated that and suddenly the media library and featured images were working again. Woot! Super important since otherwise y’all ain’t gettin’ comics. Here’s a WP forums thread on it if anyone else has the same issue with their wordpress site.