Color rendering mismatch

[Arthur Design Overlay]

Colors randomnly go out of wack and changes render from one file to the other. Loosing contrast and tone on document and for export. I can show you 2 different documents, both saved from the same original one. Both have same saving settings. Both have the same document color mode, color settings, and document raster effect settings. But one is dull and one is bright. I cannot understand and have been penalised in my delivery to clients for years now because of this issue!

I run on latest versions all the time, Macbook pro 2022 M1 Max.

[Met1]

How (and where) are you viewing these files after you have saved them, back in Illy? Different versions? Or different app? Different screens?

[Arthur Design Overlay]

Open on Preview, Photoshop or pasted in Keynote. All on the same computer. They all look same, dull. My last delivery to my client I have screenshot every page on my Ai. 

[Ton Frederiks]

Arthur, I think you have posted before about Illustrator files changing color after closing and reopening.

I have seen more posts about this but I (and others on this forum) have not been able to solve (or in my case replicate) the problem. Maybe someone on the Color Management forum has a bright idea: https://community.adobe.com/t5/color-management/ct-p/ct-Color-Management

or someone from Adobe Support can have a look at your configuration to see what is going on:

https://helpx.adobe.com/contact.html?rghtup=autoOpen

[Arthur Design Overlay]

Thanks. I have posted a few times already indeed. This issue is becoming more and more detrimental to my work. I will check the links you propose. Because beyond Document color mode, Color settings, Assigned color profile, Raster effects settings, export settings, computer screen calibration, I have no idea where else to search 😞