When I drag windows in Pro Tools, part of the screen goes white...almost...

When I drag windows in Pro Tools, part of the screen goes white...almost like an erasing effect. As soon as I stop the screen draws the blank spot.

This problem is a known bug in Pro Tools LE (starting with version 5.1.1). It's annoying but otherwise harmless. It can be worked around by turning off the 'show contents during drag' effect:Control Panel>System>Advanced>Performance...Click Settings Visual Effects>Custom>Uncheck Show window contents while dragging.

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