Macs are weird with permissions. I'm a PC guy but so many users have asked about the issue of permissions and Macs not reading things based on the various silos in the Mac system, they posted this for OOTP 25. Maybe some of it is relevant to your situation.
https://forums.ootpdevelopments.com/...d.php?t=352873
Whatever you do, first thing is to go to File>Backup and create a backup (not an ordinary save) but a proper backup before trying to move or repoint stuff. Good luck.