Unfortunately US also doesn't work on self-hosted WP, even
though we are allowed to insert JS inside posts.
Also, the use of < ![CDATA[ can have unpredictable effects.
Right now I am unable to import a WXR of my site into Disqus
because of the US embed. On the bright side when I check the post
(someone else wrote it) the video is already broken, so removing it
wont' have a negative effect.
Please fix use for WP! US is a wonderful tool but it won't take
off until it supports the most popular CMS in the world (which just
happens to also be free software and run by smart people)!
I second the above requests. The player does not work in
wikispaces.com wikis either, not in my webmultimediale.org/almansi
blog, which was set up for me by someone else, and I guess is a
movable type one.