Recently active topics in SlideShare tagged with typepad

I've uploaded a ppt file and linked it to an mp2 file hoste on Typepad (here: http://blog.spoonflower.com/files/spo... ). But in the edit pane of my Slidecast where I planned to sync the audio file to the slideshow, every time I hit the Play button the audio stream reverts to "paused." I can't play any of it even though when I hit the link to the hosted mp3 file it plays with no problem. Why?