This issue has been fixed by upgrading to MacOS Catalina . Various Illustrator users have confirmed that on upgrading their macOS issue is fixed.
Please comment on this thread, if this issue is fixed in Catalina (10.15.1)Jon commented
Same issue on a 2015 iMac retina with (27", 4 GHz Intel Core i7, 32GB ram, AMD Radeon R9 M390 2 GB.)
There is a similar bug (with more votes) report regarding Illustrator here: https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/38111224-illustrator-2019-gltches-out-video-card-in-macs-wiJon supported this idea ·