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Resolution is poor since upgrading to 4.0.1.

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How can I fix? Am running Windows 7 Pro, Viewsonic VA2231w-LED monitor, ATI Radeon HD 5800 Video. Please don't suggest resizing the page, that isn't the problem.

How can I fix? Am running Windows 7 Pro, Viewsonic VA2231w-LED monitor, ATI Radeon HD 5800 Video. Please don't suggest resizing the page, that isn't the problem.

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Forgot to add: Screen resolution 1920 x 1080