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Direct3D 8.1 : flicker issues?

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I have a 2D engine running in a tight loop, and call this function many many times over: pID3D_Device->Clear(0,NULL,D3DCLEAR_TARGET, D3DCOLOR_RGBA(128, 128, 128, 255), 0, 0)); Symptoms: If I look very, very attentively, I can see flickering near the edges of the screen, especially in a horizontal line going across the very top of the view area and the corners. These "flicker zones" are lighter than the color I am drawing, not darker. For the D3DPresent_Parameters structure, I have tried all numbers of backbuffers, and all sorts of syncing methods. It happens on all computers I''ve tested it on, and at refresh rates as high as 120Hz. Please help if you can-- my job sort of depends on this. :-o Thank you :-)

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