On a related front, the Mac Observer is reporting on other compatible pro apps stating that Final Cut Pro X 10.3.4, Motion 5.3.2, Compressor 4.3.2, Logic Pro X 10.3.1, and MainStage 3.3 (or later) all will be compatible with High Sierra. If you're running earlier versions of any of these apps, don't upgrade your OS until you get things sorted out.

There are kinds of apps including Apple's own apps that won't be supported by macOS High Sierra if you don't update them, say Final Cut Pro X 10.3.4, Motion 5.3.2, Compressor 4.3.2, Logic Pro X 10.3.1, MainStage 3.3, etc. Make sure you have updated them before upgrade to macOS High Sierra 10.13.

Final Cut Pro 10.3.4, Motion 5.3.2, Compressor ...