Audio Playlist Feature in WP 3.9

I added an audio play list to a page where I describe my Podcast.

The list shows fine on the edit page but not when the page is displayed.

On display it shows an empty rectangle.

I tried it both with my theme (intrepid) and with the 2014 theme.

Thanks.

Here is the page:

https://www.figueroafinancial.com/es/podcast-ayuda-y-esperanza-para-tus-finanzas/