For those of you with blue lines and flickering issues on ATI 6 series hardware maybe try hotfix 11.4c. I have a 5870 quadfire setup and have never had the lines on the horizon problem so I think its an ATI driver problem specific to 6 series cards and not a COD problem.
AMD Catalyst™ Driver 11.4c Hotfix Feature:
Resolves intermittent flickering issues seen in the following applications in a system using an AMD Radeon™ HD 6600 series graphics card with DDR3 memory and running in DirectX® 9 mode:
Civilization 5
Dead Rising 2
Fallout 3
Mafia 2
NBA 2010
ShenGuiChuanQi
Starcraft 2
Warcraft III
World of Warcraft
Build Info:
DriverVer=04/27/2011, 8.840.9.0000
8.84.9-110427a-118103E
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