[Nevin Douglas]

It might be the frame resampling. This is an issue with vegas that I just discovered.

Frame Resampling can cause a slight “ghosting” or stuttery look to the image. Vegas has resampling activated by default. To deactivate it, select your video clip, then go to Edit->Switches->Disable Resampling.

I’ve got a photo illustration here:

https://cruellegaceyproductions.files.wordpress.com/2012/10/vegas-resample-control.png

Hope this helps!