I've just noticed I get no thumbnails displayed on any post listing pages. It looks as if all were blacklisted, but there's no sidebar link to unhide them. I checked in the web inspector, and indeed all thumbnails get the "blacklisted" CSS class. Any ideas what caused that? It's a recent thing, it worked yesterday night.
EDIT: There are also several JS errors, including "Undefined identifier: $", which suggests a fuckup during Prototype import.
Updated by DschingisKhan