After Effects CS3/4 adding jagged chroma lines!!??!!??

I captured a quick test file using Premiere straight to the hard drive. I open Premiere and After Effects and when I add the file to the timeline, I get these jaggies.



When I play the file alone in vlc, there are no jaggies so the file is fine. Vegas Pro displays it correctly. I even set the file to progressive and that doesn't fix it. So it's definitely an issue with Premiere and After Effects. I can fix this in AE by applaying a deartifacter plugin. But i shouldn't have to do this. Why is Prem/AE screwing with the file?