Changing theme doesn't upload the video

The upload form relies heavily on javascript and also on the upload/preview/submit buttons having their normal id...does your custom theme output the video upload js in the head tag? If so, does it throw any errors? If there aren't any errors, what happens when you hit one of the 3 aforementioned buttons?

I've just committed some js-related changes, so perhaps the new version will work a bit better.