MOving user prefs window on win764bit with 2.55 B , causes black artifacting around entire window as its drawn.
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Please provide results from "Help->System Info"
Could you also test different draw methods to see if this makes a difference "UserPrefs->System->Window Draw Method".
Assigning to Nathan.
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Tagged as needing more info.
You could try disabling desktop effects to see if this makes any difference too.
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Duplicate of https://projects.blender.org/tracker/?func=detail&aid=21213&group_id=9&atid=498