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QT 7.03 for Windows / SMIL / RTSP (possible bug)

I've come across an interesting problem that I simply can not figure out.
 
I have a simple SMIL file (listed below) that joins a caption file (as text) and QuickTime movie.
The QuickTime movie was encoded using Cleaner XL / Sorenson 3.1 Pro and is streamed from a Darwin Streaming Server.
 
The problem is this: When you open the file in QuickTime it plays fine. You can use the slider to jump to any point in the movie and everything is synced up. If however you move the slider to the beginning of the file (like the first minute or so), there is NO AUDIO.Moving the slider to the middle or end of the movie and there IS audio. But for some reason, moving the slider towards the beginning of the movie produces no audio. If you wait like 20-40 seconds, it will EVENTUALLY play the audio track. The movies I'm testing with (there are like 500 of them) are all between 10 and 30 minutes long.
 
Here's what I know about this issue.
It only seems to happen when the MOV is streamed via RTSP.
It happens on multiple versions of DSS.
If the file is local, audio playback is normal.
This only happens on QuickTime for Windows 7.03
I don't have any older versions of QuickTime 7 to test with
QuickTime 6.52 for Windows works properly
QuickTime 7.03 on Tiger works properly.
The movie streamed as is (without the captions/SMIL) works properly
 
Any ideas? Workarounds? Is this a bug in QuickTime?
 
 
 
<?xml version="1.0" encoding="UTF-8"?>
<smil xmlns:qt="http://www.apple.com/quicktime/resources/smilextensions" qt:autoplay="true" qt:time-slider="true" qt:fullscreen="fullscreen_full" qt:immediate-instantiation="false">
<head>
<meta name="title" content="Test Video"/>
<layout>
<root-layout background-color="black" width="400" height="350"/>
<region id="videoregion" top="0" left="0" width="400" height="300" fit="fill"/>
<region id="textregion" top="300" left="0" width="400" height="50"/>
</layout>
</head>
<body>
<par>
<video src="" region="videoregion"/>
<textstream src="" region="textregion" system-language="en" system-captions="on" title="English Captions" alt="English Captions"/>
</par>
</body>
</smil>
 
 
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