User blog comment:Dopp/Technical Update: April 26, 2011/@comment-1393830-20110427175825/@comment-1997905-20110428022205

At this point I've determined that the chance it isn't a server side problem is slim to none. Pages are being returned as mangled JSON strings, which didn't happen before the update. I managed to intercept a whole page that was transferred as JSON (console confirmed it was transferred with the wrong mime type), in the format of an api.php query - or in simple terms, index.php is quite confused about the data it's supposed to return. I just sent in a message to Special:Contact with "for Dopp & engineering" on it with a copy of the received JSON, so hopefully engineering will look at it. For all we know, it could be messing with Wikia functions, as well as AjaxRC.