Yeah, I couldn't tell you for sure- but if your display drivers are up to date, then I'd go with it either being a badly mastered title or an issue with your monitor. I've actually been working with Warner Home Video on some blu-ray projects and while I've come across a few title with less than perfect images, by and large seeing artifacts (that aren't intentional) is pretty rare.
Well, I think the only way to rule out the video card at this point would be to use it for something else... if it will play a 3D game fine, then it's either a driver issue or perhaps your movie player.
You'll need to be more specific about your LCD monitor. Model number would be good.
When I'm playing mirror's edge, I get a horizontal line at middle of the screen when I quickly change directions...my lcd is a L227WTG from LG. It says 2ms response time...but why is there the horizontal line?