Could you give me a bit more information about your clip please, is it quicktime or avi? where did you export it from? what are its dimensions?
Also is it only this particular clip or does it happen for all uncompressed movies, if so if you could email me say 1-2MB clip for me to test i'll hopefully be able to fix the problem for you. firstname.lastname@example.org
I've downloaded the demo of this Roxio VideoWave editing software and exported an NTSC clip using Uncompressed AVI. It shows up fine in Chromanator, and exports. Have you got the latest version 1.0.4?? If you have further problems, try exporting from VideoWave using another format.