Not contrast per se, but last year I did report to this board that my 505 took a little while to "warm up", and during those first 20 or 30 page turns, the two pages would display simultaneously for a very short time, rather than do the simple "flash". Once I warmed the back of the cold metal with my hands, this behaviour would go away. Its not been cold enough for that to happen to me yet this winter.
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