Imported large one hour AVI file. Did normal editing, applying of filters. Rendered as uncompressed AVI. Plays fine. Left all files on timeline which now has several dozen additional event splits where I chopped out more video. Result a much shorter video.

Started to render as a second AVI. Now during rendering preview window shows severe ghosting and motion blur anytime there is moderate to fast motion in the video. Specifically, if someone does something as simple as wave his hand the frames between the start and end of the wave "ghost", so the image of the hand remains where it don't belong as a ghost. Once the hand wave or other action is complete the render is normal again. If someone turns their head its like a ghosting TV picture where you see two, three ghost images due to poor reception.

The thing that's odd is this distortion did NOT show up in the original render and I added nothing to the timeline. I did not apply any filters. Only action on my part was cutting.

Experimenting, I removed the SFK files generated from the first render and now doing a third render the ghosting is now gone.