Audio Shortcode

Hi, I was using this short code to show this mp3

[audio mp3="http://mywebsite.com/wp-content/uploads/2014/01/podcast-1.9.1.mp3"][/audio]

And it was working, but lately is not showing the mp3 player, but a button like any button, then if I click play, it plays the audio, but the audio player does not show. Any ideas?

http://codex.wordpress.org/Audio_Shortcode

Thank you