Compressor 3 won't recognise aspect ratio

I have an FCP6 Project with many sequences all of which were edited in 16x9. The source footage is DVCPRO 720 and I have been editing in standard DV widscreen
I have tried exporting the time line through Compressor but it outputs it as 4x3. I have exported a quicktime movie from FCP and bringing that into Compressor but it still thinks it's 4x3.
In the AV Attributes tab in Compressor the video is as follows:
Encoded bounds 720x576
Display bounds 1024x576
Pixel aspect ratio CCIR 601 (16x9)
Why won't Compressor process these films in 16x9?
Thanks
Dean

I forgot to mention that the Quicktime movies play perfectly in Quicktime.

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Message was edited by: Haberdasher

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Compressor 3 won't recognise aspect ratio

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