Thanks for following up! It’s really a shame that some mac users seem to have this issue, I hope I can figure it out.
The game won't be able to do anything like unlock CGs, access settings or make saves since for some reason your computer isn't allowed to access some of the game's files, so what you're describing makes sense.
Another possible reason is that if you have an anti-virus, it might be blocking access to the game’s files. If you have one you can check its settings and the apps it allows, and set THJ to be allowed.