A short example would help immeasurably. We'd also need to know which Vue (4,5,6)(Esprit, Pro, Infinite, Xstream), whether or not it was the most recent official build or a new beta build, etc. If the terrains overlap, is there any sharper examples of this 'noise'? Function issues in the materials can show most where two separate bits of geometry intersect. If it is just in areas where shadows are occurring and moving due to the changes in camera/light angles, there could be several causes, none of them related. Or it could be something simple, like rendering out to -compressed- images. That usually bites everyone; they render to jpeg, and artifacting occurs due to the compression algorithm. You can set the animation render option to 'full frames Uncompressed', and turn right around and use one of the compressed format extensions and have your OS turn right around and compress it for you. More common in Windows, but it does happen, and the artifacting will drive you up the wall. What image extension did you use?