Vista - Movie Maker: Only shows first few seconds of video.

I've been converting .flv files to .wmv, and then importing the .wmv clips
into the WMM collection.

The movies are generally simple, usually with a single imported .wmv file
and a .jpg at the end with no transitions other than fade in/out. The audio
is not muted, but also is faded in/out.

All seems to go well until the movie is published... The resulting .wmv
video plays normally for the first few seconds, and then I lose the video
and the audio. Oddly, I notice that .jpg at the end plays normally.

Subsequent production of the same project produces the same results, but
usually in different places of the movie.

I'm running an AMD Phenom quad-core 9600 and an nVidia GeForce 8500 GT 1mb
video card.

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