Comment 22 for bug 1131428

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Zuofu Cheng (zcheng1-9) wrote : Re: Loss of correct mouse focus, Win 7 64bit

Along the lines of what ~suv reported, this happens when you have certain software which accesses the Desktop Window Manager (DWM) frame buffer. In my case, I was using an app called 'deliner.exe' which reduces the interlacing effect to some IPS monitors when running at refresh rates higher than 60. A temporary fix is just to quit out of the app using the Windows task manager.