Thank you, thank you, thank you mossalot! I have been searching on and off for 3 days trying to figure out why my audio would not play. I could see the player, but nothing happened when I hit the play button. I just re-attached the mp3's using "File URL" and it's all working perfectly now. What a relief!
I wish the plugin author would put this in his FAQ's or something. I'm sure I'm not the only one who's had this issue.