Why when I export an MP4, I get a white screen?

I've had Quicktime Player 7 Pro for awhile now. Before I had no problems exporting movies I created in After Effects from Quicktime as an MP4 and playing them back. But now, when I open a movie I created in After Effects and export it out of Quicktime as an MP4, it has great audio, but only shows a white screen. What has happened?
Please help?

I think I figured it out. What I was doing was opening a MP4 I created in After Effects and rendering it out of Quicktime to a MP4 to make the file smaller. For some reason this doesn't work anymore.
But, if I render a mov in After Effects and then open that in QT and render it out to a MP4, it works fine. You know why this is?
Where do I find the codec being used in the Inspector window?

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Why when I export an MP4, I get a white screen?

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