i think there is a problem in jquery.jplayer.min.js file which one i am using.
My jplayer is not working in only IE9.
its working in all other browser.
I had the same issue. Resolved it by forcing IE9 to use Flash instead of html5.
jPlayer({ "solution": navigator.userAgent.indexOf("Trident/5")>-1 ? "flash" : "html,flash" })