Multiple instances stop working

On this page in Firefox on the Mac

http://ouibis.com/mandoSymmetry/mandolin-tutorials/scarpology-mandolin-tutorials-home-page/scarpology-improv-book-media-page/
After about 8 instances of links to MP3s, the links stop working. That is to say, the top 8 links work in the player while all below that number do not.

FF on Windows and any other browsers on Mac seem to work for me. Just a heads up.

I can’t find anything odd in the HTML.

http://wordpress.org/extend/plugins/wp-miniaudioplayer/