It just springs up in the dock, and doing nothing. I don't have any kind of error nowhere, no splash screen. After the restart, I have the exact same problem. Later this morning, my Google Chrome was acting up, so I thought, I'll just reboot, it'll be fine. I'd also like to add that it was ONLY Illustrator that was acting up. It ended up being the repair disk that did the trick, and the app launched correctly again. I checked a couple of things : wiping the preferences, Repair disk permissions, uninstall / reinstall. This morning when I came in, it won't launch. Yesterday, my Illustrator CC 22.1 on OSX 10.13 was working fine. I have a weird problem, that started happening all of a sudden.