After update 2015.8 , Tones curves are always erratic and seems glued if picture have a little brush edit (less than before, but not funny to use), try the curve on Capture one Pro, it's smooth and perfect and i want this on lightroom, please Adobe, Optimize your software, update after update it become like a dinosaur, if switching to Capture one would be more easy, I would change for it today. and for informations, the "X" shortcut (reject photo) in library mode, don't work anymore,
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