I am trying to insert swiffy output in a page, following your instructions, and it appears that the pieces are going where they belong - the long piece of script goes in the head, the div with the results of the shortcode goes in the entry content, and the shorter script goes at the bottom, before the "</body>". However it's not showing up on the displayed page.
As per your response to a previous support request, I turned off all plugins except this one, and it still does not appear.
I have tried it just in a regular html page and the swiffy works fine.
If you'd please take a look, see: http://jillweltlifetransformations.com.
If this doesn't work with 3.5.1 how about telling us?