Mojave 10.14.6 / Ill version 25.2.1 / GPU Performance Activated / AMD Radeon Pro 570X
The ai file opens in CPU preview and cannot return to GPU. Colours seem altered, very vivid. That happens to all files with linked images! I worked as ususal, can't remember if any update run.
I have downgraded Illustrator to 25.2, & Photoshop to 22.2 and problem was not fixed.