Lightroom Classic: Color management problem using XRite i1 Pro profiles

I created a custom ICC using the XRite tool and placed in under /Users/<username>/Library/ColorSync/Profiles.

What specific X-Rite "tool" did you use? I think you're confusing monitor calibration icm profiles (i1 Pro, Colormunki, etc.) with camera calibration DNG profiles (ColorChecker Passort). Both devices use software to create custom profiles that are "automatically" installed to the appropriate system folder. You will need to restart LR to load the newly created monitor or camera profile.

i1 Pro. The ICC existed in my user directory only. The Adobe software should be looking in both the user and system Library directories. ..and nope, not confused by the monitor calibration files.

"and nope, not confused by the monitor calibration files."

I don't understand this. The XRite i1 Pro does just that: create monitor profiles. So what do you mean with the sentence above? 

Per the bug description: I found that the display of images in the Library and Develop modes will differ if the custom ICC files are not located in both the system and user directories. From my testing, The Library mode did not use the ICC located in the user directory, whereas the Develop mode looks in both the system and user directories.

Of course it is possible, that I am wrong in my analysis, .. but these are my observations. Note: I import RAW Nikon images and convert them to TIFFs via the Nikon Capture NX-D

--Eric

Unfortunately I'm on Windows so can't verify what you're seeing. Someone else landing with a Mac system and X-Rite monitor calibrator please see if you can verify the OP's issue.

Before trying the following suggestions please close all applications and restart your  system.

Please create a new monitor profile using the X-Rite i1 Profiler software and check that it's assigned as the "system profile" as outlined at the below link. Do NOT "manually copy & paste or move the monitor profile.

https://www.xrite.com/service-support/monitor_profiles_how_do_i_use_them

Before creating the profile make sure the i1 Profiler Preferences are set to ICC Version 2 and NOT 4 as outlined at the below link for the Colormunki. The i1 Profiler should have a similar Preferences setting and on Macs it's set to ICC Version 4 by default. You want Version 2.

https://www.xrite.com/service-support/profile_version_icc_v2_or_icc_v4

Next close and restart LR, which will load the new monitor profile and allow LR to use it.

1) If you're still seeing a difference between Develop and Library modules go to menu Library> Previews> Build 1:1 Previews and compare again.

2) If the difference persists go to menu Edit> Preferences> Performance and uncheck 'Use Graphics Processor and compare again.

If you're still seeing a difference please post screen shots showing the Develop and Library Loupe previews. There have been no reports of this issue after performing the above suggested step that I am aware of.

Bizarre.. recreated the ICC profile... all is good.

* using the i1 Profile software v 7.12 -- there is no obvious option to select a version 2 or 4 ICC format
* the software when run as a non-admin user is prevented from directly installing the ICC into the system directory. However, not a problem to do so via an sudo command. Obviously I _could_ change the perms on the system directory, but this is generally not a good idea.

Thanks for all the comments. Hopefully I will not encounter the color shifting issue again .. any time soon.