Video stretched when exported even when "letterbox" is checked

Hi, I'm trying to export a lower quality version of one of my HD movies. I've previously been able to do this when I export using Quicktime Conversion at 640x480 with the "letterbox to preserve aspect ratio" option checked. However, I just did exactly that but when it is exported the video looks stretched and distorted and no letterbox bars appear on it. I've tried switching from H.264 to m-peg4 converter to see if that would make a difference but it is still exporting stretched videos. Why has this suddenly changed, and are there any fixes you know about?
Thanks!
Andrew

Try creating a new Project with the Sequence settings matching the footage correctly. Then copy/paste the the incorrect Sequence into the new matching Sequence.
Al

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Video stretched when exported even when "letterbox" is checked

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