Exporting to iPhone
 

When exporting EX1 footage off the FCP timeline using the QT Conversion iPhone preset, it automatically letterboxes the clip. I've just cut a piece shot on the 7D and transcoded to XDCam EX codec for editing, and when exporting the same way the clip is squeezed, not letterboxed. The Options menu is grayed out. Any suggestions on getting the clip to export at the proper aspect ratio?

Thanks.