TIFF is fine. Hold up pretty well in post.
Ensure the resolutions is not above 4K, FCP can freak out with files that big.
One place that trips a bunch of people up is pixel orientation. FCP assumes graphics file are in square pixels. It adjusts the image to compensate for the difference in pixel aspect ratio between the image and the sequence.
Read these!
http://docs.info.apple.com/article.html?artnum=36836
http://documentation.apple.com/en/finalcutpro/usermanual/index.html#chapter... (scroll down a little bit)
~Michael
.: michael kammes mpse
.: senior applications editor . post workflow consultant
.: audio specialist . act fcp . acsr
.:
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