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How can I get it to update/refresh its window the way it's supposed to? I'm using windows 8 and I was able to get blender to work before, but after reinstalling windows 8 and blender, blender won't update/refresh its window unless I move, resize, maximize, or unminimize it. This makes blender completely unusable. I have already tried reinstalling blender and turning my computer off and on again.

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    $\begingroup$ sounds like you need to update your video card drivers, if it worked on this hardware before, the main difference will be your drivers. -- not really a Blender specific problem.. $\endgroup$ – zeffii Jul 28 '16 at 14:55
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I had a similar, but perhaps not identical issue.

In File->User Preferences->System, changing Window Draw Method to Triple Buffer from Automatic fixed it for me.

I suggest fiddling with all the Window Draw Method options, if that fails.

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I encountered this exact issue, but on Windows 10. Blender started behaving that way after I turned on high contrast color mode in the Windows appearance settings, and was back to normal when I turned it back off. No idea if that is applicable to your situation, but might help someone else searching the issue.

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