You can reset this in the application’s settings, but you’ll need to do this every time you launch the app. Illustrator CC 2017 will default to emulating the Illustrator 6.0 colour space. Illustrator CC 2017 High Sierra compatibility If you change this to Case Sensitive, things will break.

Note: for any of Adobe's Creative Cloud applications to run correctly, you need to select the default version of the new files system APFS (called Case Insensitive). Now updates from Apple, Adobe and Wacom seem to have largely fixed the problems.

These didn't affect everyone – but had the potential to prevent you from working (as once you upgrade you can't go back). When Apple first shipped macOS 10.13 – aka High Sierra – it was quickly discovered that there were issues that could prevent Illustrator and Wacom tablets working at all, and make InDesign unusable after a period of use. It seems it's now safe to upgrade to macOS 10.13 as Wacom tablets and Adobe Illustrator and InDesign are now supported – though you'll need to be careful during upgrade and use a pre-release version of Illustrator.

Indesign cc 2017 stopped working