I have had no issues with illustrator until a few weeks ago when it started crashing on startup (opens for a millisecond only) every time. I did some research and managed to get around the problem by allowing my mac to switch graphics cards as needed. Unfortunately, the problem has happened again. I have ensured I have enough memory on my computer, cleared out old files, desktop files, I have uninstalled Illustrator CC, and reinstalled it but the problem still persists. I have had Catalina OS since the OS was upgraded and from what I can read this causes issues. As a design business (sole trader) I cannot afford to have this problem. Please help.