I have a clip, medium pan left to right, 1080i. I need to slo-mo to 50 percent. The final render to DVD is very jittery. I've tried changing the clip's frame rate to 50% in Vegas, as well as in Twixtor Pro. I still get the nervous jitters! Motion Blur set to Gausian, Deinterlace method set to Interpolate fields, Disable resample. What am I doing wrong?