Lightroom CC 2015: Develop Module - image 2 stops darker than Library/Print Module Image after upgrading to El Capitan 10.11.2 and Adj. Brush is Buggy

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This is a report of a Lightroom CC 2015 problem after upgrading to El Capitan 10.11.2 on an iMac early 2009 with 8Gb of memory, 2.66 GHz Core 2 Duo, GeForce 9400 256 Mb memory. Problem is in Develop module, whether "Use Graphics Processor" is checked or unchecked. An image in the Develop module is about 2 stops darker than the same image in either Library or Print Module. Attempted edits in this darker Develop module do not carry over into the Library or Print Modules. Also, adjustment brush is surrounded with a brighter square and does not work normally. Activating "Soft Proofing" restores the Develop module, and after creating a virtual copy, Develop module seems to function normally, though on a "Proof" copy. Since this computer was a late adopter of El Capitan, I can report that no problems existed under Yosemite. And, LIghtroom CC 2015 1.1 Develop module functioned properly in the early version of El Capitan, before 10.11.2. A second computer, a Mac Pro Early 2009, 2.93 GHz quad Core Xenon, 32 Gb memory, Nvidia GeForce GT 120 512 memory does not exhibit this strange Develop module behavior. To reiterate, it appears that LR functioned with no Develop module problems until the El Capitan 10.11.2 update. Rolling back to LR 2015.1.1 shows this Develop module behavior even though before El Capitan 10.11.2 there was no such problem.
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Walter Knox

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Posted 3 years ago

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Victoria Bampton - Lightroom Queen, Champion

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For any engineers reading, there's more information here: http://www.lightroomforums.net/showth...
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Heiko Bertram

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I encounter the same problem with my recently bought (march 2016 so brand new) MacBook Pro 2012 with mac os x 10.11.4 . Any solution found? Please let me know

heiko bertram 
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Walter Knox

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Take a look at the posts at the link above, in Victoria's comment. Karl has found a cause for this behavior based on the monitor profile being used. He has a Macbook Pro using an external monitor. I have found that even the newest iMac can exhibit strange behavior moving from Library to Develop Module and back again if graphics acceleration is active and a Look up Table Display Profile is being used. Even a late 2015 27" iMac with i7 processor, 2Tb fusion drive and the fastest GPU available with 4Gb of VRAM shows anomalies - with the image darkening when shifting back and forth between modules. The darkening is only for a few seconds, but is very similar to the behavior I reported above on a 2009 iMac. The LUT profile created, if nothing else, is a much larger profile than a standard matrix profile, or the original profile provided by the operating system. The profiles used for the systems here are XRite profiles.
Is it correct that you have a 2012 Macbook Pro? There are lots of different ones - 13", 15", retina and non-retina if my memory is correct. I think you have 2 GPUs, one NVIDIA and one integrated.

 Lightroom runs on my late 2013 Macbook Pro with integrated IrisPro GPU selected, but un-selecting the checkbox for acceleration in LR preferences actually makes the system run somewhat better, so you might want to try that if you haven't done it yet.
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Sandro Franchi

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Verified also by me, just recreating the profile in matrix mode (XYZ PCS instead of Lab) did solved the problem.