Studio one 3 Professional 3.5.5 does not find script folder (/applications/Studio One 3.app/contents/scripts) upon opening the program in "APFS" formated boot disk. When you go to the location provided, it exists in a given location, and has following files (audioedit.package, musicedit.package, projectedit.package, toolset.package, trackedit.package and voodoo.package).
When opened from the installation disk image (PreSonus Studio One 3.dmg) Which is formated to "Mac OS Extended" filesystem, the program opens normally, and does not give error that it does not find the script folder. When the same location is opened in the app inside the installation disk, it has same following files inside the "scripts" folder: (audioedit.package, musicedit.package, projectedit.package, toolset.package, trackedit.package and voodoo.package).
I have tested older versions (3.5.3), and re-installed and re-downloaded the app (3.5.5) in case there was isntallation or download error, but the results where same. Also have rebooted the computer several times.
Your Computer Make and Model: Apple iMac (21.5-inch, Mid 2011)
Operating System and Version: 10.13.3 (17D47)
Application Version: 3.5.5 Build 45892
Audio Interface and it's Driver Version Focusrite Scralett 18i8 [1st gen] V.2.60