This is what I tried and it worked: I went to without a file open, I went into Illustrator’s Edit>Preferences>GPU Performance. In GPU Performance, I noticed that the checkboxes for GPU Performance and it’s subcategories Animated Zoom and Enhance Thin Lines weren’t checked, so I checked them. I am not sure about the necessity of “Enhance Thin Lines,” but I don’t want to experiment with turning it off right now that I have Illustrator working (I will experiment with that later). One of the Adobe people: Jmaster808 at forums_noreply@adobe.com<mailto:forums_noreply@adobe.com>, gave the below advice: “Delete your AI preferences and cache in the library and restart your computer. Good luck!” I hope this helps! Karen
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