I'm working on a Windows 7 in Illustrator version 23.0.1
The very first time I opened the program the file had a big cutout in a triangular shape, and clicking anywhere on the document or even just moving the mouse around causes it to glitch further by adding random colours to the document and displacing the objects in the document.
After the first time this happened I uninstalled and reinstalled the program but that didn't work. I also just updated to the newest version of Illustrator today but that also didn't work.
Attached are screenshots of the glitches.
Is GPU preview on? Try to disable it.
cristina nikolic commented
Anyone else experience this issue?