Prettyphoto objects open behind any embedded youtube objects. So if you have a youtube movie, and a [facy_images] shortcode under it... when you click on the photo, it opens up but the youtube video sits on top of it.
Is there anyway to properly hide that youtube video or force prettyphoto over it?
I can set up a test page for you to see this happen, but it is easy to do on your own. Just embed any youtube video using their iframe and them put a [fancy_images] image below it, then view that post and click on the image.