In develop module image is very different than in library and exporting

[frola26728472xye5]

Hi. In LRC 12.3 in Monterrey 12.06 Sony A9 RAW. Occasionally, for no apparent reason, after development, the image in the library module is totally different. Returning to development module and exporting, the image is not as desired. I try differnt color space in exporting but without solution. I attach a demonstration video. I'm sorry but this problem was not solved by the answers I found in the community referencing a post from 2017.I'm really worried because I start my wedding season in 15 days Please how do I fix. THX

[D Fosse]

Most likely a GPU bug (or possibly defect monitor profile). Disable the GPU in Preferences and check again.

The histograms are identical, so the actual data are the same.

[frola26728472xye5]

Thanks D Fosse. I'll try your solution, but i have another doubt:The problem does not always occur, but randomly and not with all files.

[frola26728472xye5]

So my question is: is it possible that the problem does not occur continuously but only in particular cases whose characteristics I don't understand? 

[D Fosse]

If it's a GPU bug, it can depend on a lot of external factors. It can be unpredictable.

Turn off the GPU here and see if it still happens:

If it's a defective monitor profile, that tends to happen more often with ProPhoto than other color spaces, because ProPhoto is so huge that small errors get amplified. Library Previews are Adobe RGB, while Develop is a custom color space with linear tone response curve and ProPhoto primaries.

[johnrellis]

To build on D Fosse's reply, quickly test whether it's a defective display profile:

https://www.lightroomqueen.com/how-do-i-change-my-monitor-profile-to-check-whether-its-corrupted/