basically. it is not due to the codec. it is not compression artifacting but some kind of interference being displayed in clips.
at frames 2209, 2226, 2247, 2272, 2284.
as you can see, it affects a layer, not the whole clip. ie it is interference being caused by Vegas' own outputting. if I output again, similar appearance seen, but at different frames.
specific to certain clips. all clips are RGB when put into vegas project timeline in huffyuv codec. . none of the original clips have any visible problems when displayed on any other video playback programme, it is only within vegas that this wierdity is being introduced and even then, it does not consistently apply it, which implies some bug within the program rather than the clip itself. at least to my way of thinking anyway.
*edit*
link
lightsabers