I recently created a PDF with an embedded FLV file. I'm using Acrobat X Pro, so embedding the file created a Rich Media Annotation (RMA). From what I've read, anyone using Acrobat or Reader version 9 or later should be able to play the file. However, one of my readers on a Mac can't play the file, and in fact, doesn't even see a preview of it on the page. He just sees a blank spot.