After the upgrade to V2 of Jetpack my Steam Video PLayer by http://rodrigopolo.com no longer works. I get the "(Video)" error. Refer to this post for the error: http://rodrigopolo.com/about/wp-stream-video/faq#the_excerpt
I have had to uninstal Jetpack and go back to version 1.8.1 for me to have both Jetpack and Stream Video work on my site.
Thought this may be useful to those with a similar issue.