HTTP Streaming working on XP but not Vista

HTTP Streaming is working on XP but not Vista:

Here is my script:

<script type='text/javascript' src='http://wpc.11BF.edgecastcdn.net/0011BF/IA_Media_Player/swfobject.js'></script>

<div id='mediaspace'>F8</div>

<script type='text/javascript'>
var so = new SWFObject('http://wpc.11BF.edgecastcdn.net/0011BF/IA_Media_Player/new_player.swf','mpl','640','500','9.0.124');
so.addParam('allowfullscreen','true');
so.addParam('allowscriptaccess','always');
so.addParam('wmode','opaque');
so.addVariable('file','http://wpc.11BF.edgecastcdn.net/0011BF/Videos/ACF8S03P3H.flv');
so.addVariable('skin','http://wpc.11BF.edgecastcdn.net/0011BF/IA_Media_Player/new_player.swf');
so.write('mediaspace');
</script>

On Vista it just shows a blank page