Large video hangs in Firefox mac + Internet explorer

Has any one experienced this?

I have a 26MB video and I'm running JWPlayer 5.7. It works fine for a little test video but when I implement the larger video the video just loads and loads and nothing happens. This occurs in Firefox 5 and 6 on Mac and IE8 on Windows. Works fine straight away in Safari and Chrome across the board.

Here's the generated HTML code:

<div id="jwplayer-1-div">
	<div id="jwplayer-1_wrapper" style="position: relative; width: 620px; height: 400px;">
		<object id="jwplayer-1" width="100%" height="100%" type="application/x-shockwave-flash" data="http://www.auzion.com/files/jwplayermodule/player/player.swf" bgcolor="#000000" name="jwplayer-1" tabindex="0">
		<param name="allowfullscreen" value="true">
		<param name="allowscriptaccess" value="always">
		<param name="seamlesstabbing" value="true">
		<param name="wmode" value="opaque">
		<param name="flashvars" value="netstreambasepath=http%3A%2F%2Fwww.auzion.com%2Fabout-us&id=jwplayer-1&className=jwplayer%20jwplayerInit-processed&wmode=opaque&file=http%3A%2F%2Fwww.auzion.com%2F%2Ffiles%2Fvideo%2Fpage%2Fxyz.mov&controlbar.position=bottom">
		</object>
	</div>
</div>

I'm lost, please help!