OK.. I solved the problem… I got into work super early this morning so at least I could see it on an output monitor to work out what the problem was..
The footage I imported was interlaced.. So I interpret it to upper fields first…
Made everything else.. even a still jpg frame (which also jittered) upper frame..
then rendered out with fields.. with upper frame..
smooth animation…
Thanks for all your help.. sorry if I was a bit vague.. but I’ve been working long hours on this.. and then finally when I think it’s ok to deliver.. I get thrown a curve ball…