Is Kaltura currently supported by the bookmarklet? I saw a post from a couple of years ago mentioning that you had to modify some files to make it work, but am not sure if the same modifications still need to be made now or if there is something else to be done. When I just tried to bring a video in from Kaltura, the collect interface didn't load properly on the first attempt, and then on the second attempt it appeared to work but the player doesn't load back in Mediathread's collection view. The only immediate thing that I can see going wrong is Mediathread is trying to load
http://mediathread.ccnmtl.columbia.edu/crossdomain.xml on playback and getting a 404.