Hi,
First, thanks for an awesome free player.
I'm using the latest version (as I just downloaded it a couple days ago). I don't use playlists, or fancy shmancy extra Javascript API calls...
On the Mac side of things, everything works great.
However, on the PC side, when I click on either the Preview Image's play button or the control bar's play button, the Preview Image does not disappear, the play bar jumps to 3 sec., and then the video starts playing behind the Preview Image.
When I click on either play button again, the Preview Image disappears and the video begins playing from the start (as it should).
Another thing is that when I press the stop button, the Preview Image is displayed (as it should), but then when I press either play button, the Preview Image disappears briefly, briefly reappears, then disappears again before the video begins playing normally.
This odd behavior occurs in Firefox, Safari, Netscape, Opera, but curiously enough, not in IE6.
The path for the preview image is a relative path (easy enough as all my files are in the same folder).
Oh and BTW, I couldn't get the Preview Image to display at all until I changed the extension from .jpg to .jpeg (on both platforms and "all" browsers)...even though I did a "Save for Web" out of Photoshop as a .jpg.
<script type="text/javascript" src="swfobject.js"></script>
<div id="player">This text will be replaced</div>
<script type="text/javascript">
var so = new SWFObject('player.swf','mpl','340','226','9');
so.addParam('allowscriptaccess','always');
so.addParam('allowfullscreen','true');
so.addParam('flashvars','&duration=63&file=myvideo.flv&image=myposter.jpeg&bufferlength=2&volume=80&controlbar=bottom&stretching=none');
so.write('player');
</script>I'm running a Macbook Pro 2.4GHz Intel Core 2 Duo, 4GB RAM, OS 10.5.6 with the latest compatible versions of Firefox, Safari, Netscape, Opera, and Flash Player 9.
My PC is a Dell Pentium Intel M, 1.86GHz, 1GB RAM, Windows XP (2002, sp3), with the latest compatible versions of Firefox, Safari, Netscape, Opera, IE6, and Flash Player 10.

Well there's your problem, right there; it's the fancy shmancy stuff bits that make it work.
Do you have a link to your test page so we could see this aborhent behavior live and in color?