… You can try the old “remove-one-property-at-a-time-and-see-if-it-changes-anything” technique. 😉
The interlace-like effect comes up when there’s something wrong with the frame rate, speed or pixel aspect. The setting look fine though….
Have you tried converting the footage in Cinema Tools after the update to FCS2? I don’t have much experience with Cinema Tools but maybe if you try again it might make a difference.
Wojtek Jezowski