Posted
We are still working hard to fix graphics issues with macOS High Sierra 10.13 and Synfire and/or Harmony Navigator. Apple changed some things internally (again), such that the display is not refreshed properly. It really makes no sense to update macOS at this time.
We will report back when the issue is fixed.
We are sorry for the inconvenience. However, as always, we strongly recommend updating macOS on a music production computer only after Apple released at least one update. This proved to be a good rule of thumb.