If your GFxMoviePlayer isn't calling your Init function, I bet you are loading your custom GFxMoviePlayer class through Kismet.
Apparently Kismet fires Start but not Init, at least that is the conclusion I just came to. I didn't find any documentation on this so I'm posting it here for reference.
After 5 hours of frustration, just tracked my issues down to this, but I can confirm it.
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