Our Grass Valley NewsEdit systems have had an issue with the footage that comes from CNN looking really bad. Turns out the import is defaulting mpeg2 files to bottom field first instead of top first. Changing this corrects the issue. Trouble is, this is hard-coded to be the default and will have to be changed by hand every time there is a file that needs to be imported. This was fixed when Grass Valley changed the system to Aurora.
Additional thoughts, maybe this will clean up the files that Grass Valley exports to mpeg2. When I get a moment I will have to try this out.