Last modified: 2013-11-01 02:59:43 UTC
I see this error in the Firefox console after opening the lightbox: "NetworkError: 404 Not Found - http://127.0.0.1:8080/wiki/Undefined" There is no X-Requested-With header, so I am assuming this URL appears in an image scr attribute.
Fixed now that we're using the loading GIF spinner. :)