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ComponentNotThreadSafeErr

I am opening a movie in a thread using:

err = EnterMoviesOnThread(kQTEnterMoviesFlagDontSetComponentsThreadMode);
  err = NewMovieFromProperties(3, propArray, 0, NULL, &movie);

I then set the movie active, detach it from this thread, pass it off to another worker thread, and ExitMoviesOnThread from this thread.

Everything is fine the first few time I do this.  Then, all subsequent runs through the code causes NewMovieFromProperties to return a "ComponentNotThreadSafeErr" with movie set to NULL. 

1. How is this possible with the kQTEnterMoviesFlagDontSetComponentsThreadMode flag set on the previous EnterMoviesOnThread call?
2. Why is it fine the first two or three times through.  (Note: each time the movies tried are .mp3 files)

Thanks, 
Ethan...

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