There is something odd going on. I have used Allvideos for an audio player on one of my sites. So simple and elegant I wanted to use it again.
I installed on a new site, uploaded the very same audio file, and the player displays, but there is no audio available. Click the arrow, and it returns immediately to the arrow.
The audio is mp3 and sitting on the server at 5M. It is the exact same audio that I used on the other site.
The only thing I can think of is a conflict. Does that make sense?