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Checkerboard effect all over FF window

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Arcsaber
Arcsaber
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A checkerboard effect occurs sometimes when I use flyout menus on websites - the FF window is covered with black rectangular blocks (like a chessboard); restoring and maximizing the FF window makes the effect go away. I would include a screenshot but I don't know how! (I can provide one via email if necessary).

Any ideas?

A checkerboard effect occurs sometimes when I use flyout menus on websites - the FF window is covered with black rectangular blocks (like a chessboard); restoring and maximizing the FF window makes the effect go away. I would include a screenshot but I don't know how! (I can provide one via email if necessary). Any ideas?