Small white square in top left corner of some Quicktime movies I make?

I have been wondering what that Small white square is that appears in top left corner of some Quicktime movies I make? When I export to Flash and upload, or even just upload to Vimeo an H.264 file, there it is, little white square. I put a still frame up online here http://farm5.static.flickr.com/4036/4682390438bb0c16da2eb.jpg
Cheers.
Final Cut Pro 7.0.2., Quicktime Pro 7.6.6, Quicktime Player 10.0...

Solved it by de-installing Adobe Flash Player plug-in and installing it again. All good now

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