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Scrolling screen image on my new iMAC results in a gross looking distortion within a band of pixels, and screen was not that way before FF4! egennetten@yahoo.com

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I have a new iMAC (2 months old). When I scroll up or down I get a gross looking distortion on the screen about 1/3 of the way from the top of screen. The display is set at Apple's default screen resolution of 1920 x 1080 pixels. The distortion 'thickness' is pr0bably about 5% of the vertical number of pixels; hence, around 50 lines thick!