I'm rendering a few animations from Lightwave 8 in Uncompressed Quicktime with millions of colours. I have tried Even fields first and Odd as well. I take both anims into Vegas 5 and try different variations of fielding from Properties and all results have fielding issues on renders (doubling of lines and/or "bluring" ((for lack of a better term)) ). I finally gave up with Quicktimes and rendered fielded TGAs and imported that into the Vegas timeline and the resulting anim is rock solid and perfect.
So that's the workaround to my particular problem, but shouldn't Quicktimes be perfect on the Vegas timeline?