I'm experiencing the same problem. All my files are now switching to CPU preview and GPU is greyed out. When I start a new document it switches off when I edit the artboard.
Illustrator 25.4.4 & 26.0.3 Macbook Pro (14 inch 2021) Apple M1 Pro 16gb RAM
I'm experiencing the same problem. All my files are now switching to CPU preview and GPU is greyed out. When I start a new document it switches off when I edit the artboard.
Illustrator 25.4.4 & 26.0.3 Macbook Pro (14 inch 2021) Apple M1 Pro 16gb RAM