I’m having this same issue with impress.js currently. Basically I need to put an iframe hardcoded in the template and WordPress won’t have any of it. All the plugins I find are to enable the shortcode, which I don’t need.
Sorry, here is the link with the Biolumix page Im trying to copy how the cycling fading posts are done in the sidebar.
http://www.mybiolumix.com/technology.html
