P: Library zoomed view shows wrong color

All modules other than Develop should match at the same zoom ratio at 1:1 or more. Print doesn't as I wrote and it should be fixed but if you care for an accurate preview of the data, that's Develop module only. 

The two screen shots that I posted above were from the Library module and clearly show the difference in colour saturation between Loupe view - Fit and Zoomed.

Are you saying that is expected behaviour for the Library module on an iMac/iMac Pro 5K display? While I can't be absolutely certain I don't think this was happening prior to LR 10.

I am unable to reproduce the problem you describe when moving from Library to Print. The image selected in the Library Filmstrip reliably appears in the currently selected print template.

The Print Module using a differing preview and so, this isn't that unexpected. I see the same too, the two are slightly different in terms of color saturation on a wide gamut display. 

The only location to really see the actual color of an image is in Develop at 1:1 or greater. 

Now what I do see also, and this appears to be a bug: Image selected in Filmstrip doesn't show up in Print. I even have a quick collection with ONE image, I select it in Library and move to Print, a different image appears. If anyone sees that, I'd like to know because that doesn't make any sense to me. 

This issue has been reported elsewhere and also occurs when using "Zoom to Fill" in the Print Module. I noticed it when using LR 10 on Catalina and it is also present with LR 10.1 on Big Sur. I am using an iMac Pro (5K monitor). I have tried turning off/on the GPU and have created a new monitor profile.

If you need anything else - let me know. The image has the "Adobe Vivid" Profile applied. I also just tried to rebuild the previews - no change. The color switch appears when the image zoom factor is of that size such that the image does not fit anymore completely into the view. The color is correct for any zoom factor which shows the complete image in the view, even if zoomed out a lot.

Tried the same on the MBP internal display with different color profiles - the same behaviour, it does not depend on the display nor the color profile chosen in the MacOsX Display settings.

Have you rebuilt the preview for this file?

ups - where have they gone? Another try:

No images. Did you attach them?

@Rikk sur. Here is a comparison if the image in zoomed view and original view - after screen capturing resized to show similar field of views. The right image is the correct one, at least showing exactly same colours in develop mode in different zoom states.

Interesting thing - just before zooming into the image in Lib mode, for a fraction of a second the image changes to wrong color in original size before zooming in and keeping the wrong color.

Recalibrated/profiled with PaletteMaster matrix V2 AdobeRGB (and also experimented with different settings), restarted LR10.1 with/without GPU - same issue still.