The usual issues (with 3rd party software):

  • GPGtools don’t work
  • Homebrew is broken. Fix:
    • Download Xcode 9-beta, unzip and move in Applications
    • sudo xcode-select –switch /Applications/Xcode-beta.app
    • Use ‘brew doctor’ for debugging but the above step should fix the issues.
  • In my case I had to re-add the TimeMachine disk. In my case back-ups still failed. I’ll try to make a new clean disk.
  • Docker auto-starts. I didn’t find a way to disable this yet.
  • VMware Fusion doesn’t work (more info)

Developer info:

  • Python 2.7 (default), but 3.3, 3.4 and 3.5 are also available
  • PHP 7.1.6  as default (without Zend OpCache)
  • Perl v5.18.2 for those born before 1960 🙂

Keep in mind SIP (System Integrity Protection) is turned on in High Sierra.