It hasn't been able to find MP4s for several weeks now - there's just an error message there - even though it's supposedly up to date, and I see no other video format choices. There is a link to report bugs but that seems to work only for paid users, which I'm not. One other thing - the images to the right of this box are way out of date - the interface hasn't looked like that in a long time. Since it's useless to me I've disabled it; I'll try re-enabling it in a few weeks but if it's still useless I'll remove it.