When opening Final Cut Pro 10.4.7, Motion 5.4.4, or iMovie for macOS 10.1.3 after updating, menus may appear distorted and fragmented. They might also be transparent, or colored magenta, pale-green, or other unexpected colors. This can also affect other app or Finder menus.
To correct this, choose Apple menu > System Preferences > Accessibility, click Display in the left sidebar then click the Display button. Deselect "Reduce transparency" if it's selected, then close System Preferences.