MPEG 2 export is giving me 640x480 rez

I have exported a 720x480 QT out of FCP and am now trying to encode it using any of the presets for MPEG2. When I look at my source and the exported source movie QT says that it is 720x480 - and when I set the presets in compressor - it says it is 720x480 - but once it encodes it and dumps a movie - it comes out 640x480.
Anyone have any ideas or help?

Here's an update on the problem. DVDSP 3 just finished encoding the MPEG2 file internally, and it is correct.
When I take the exact same MPEG2 file out of the DVDSP project package and import it, as I would an MPEG2 file created in Compressor, it shows up with the duration incorrect.
The good news is I can encode MPEG2 files - in the background inside DVDSP.
The bad news is I can't use MPEG2 files created in Compressor. My normal production flow has been broken.
I think that once the Finder labels an MPEG2 file as a QuickTime movie, it alters some properties of that movie to incorrect values. That's why when it is imported as an asset into DVDSP, it shows up as being the wrong length.
This business of QuickTime Player "correcting" the frame size of the movie to allow for square pixels on a computer screen is just the tip of the iceberg.
QuickTime Player 6.x used to display the MPEG2 files at their true frame size.
QuickTime Player 7.x is making an automatic "adjustment" to the file, since Apple thinks we are all obviously too stupid to go to a menu and select "square pixels" if we open an NTSC formatted file. So they HAD to add this "fix" to OT Player
But it's doing something else, too, And that "something else" has really screwed up my production flow. Maybe it has something to do with the codec definitions in QT 7. But something's not right here.
I think I'm going to try dumping QT 7 and returning to v6.5. I need to get this fixed.
To heck with the cutting edge, I have work to do.

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