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I guess it is related to its color, not size.

Edit: no, it claims to be caused by a 1px wide background image. It does work, whereas creating a screenshot of the dock color, then using that as the background doesn't work, the dock just gets lighter to compensate.
 
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I attached the 1px black background file here.
 

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Too bad it messes with the Today view colors when you slide left from the Home screen. Oddly, if you pull down Notifications, and then slide over to Today, it looks normal.
 
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