Stubbed my toe on this recently.
For some reason (unexplained, and it seems unlikely that this is an actual security issue) you can't have custom HTTP headers for file uploads in Flex 3.2 (possibly Flash as a whole). They state it in the documentation, to their credit, but it's more of an aside, tucked away at the end of an irrelevant paragraph, than a big red "HEY WE JUST CHOPPED OUT SOME FUNCTIONALITY YOU'D NORMALLY EXPECT TO BE THERE" warning.
For half a minute I thought I was in ruby and said to myself, "I'll just override this and inject the custom headers myself," then I realized where I was and went "D'oh!"
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