@Eurisko_Kaeso Your cc may be incompatible with your patch level, or you might have a corrupt file somewhere in your TS4 game folder. To cover all of your bases, you can drag that game folder out of Documents and onto your desktop. When you launch the game again, a clean folder will spawn with no content. Load a new save and play for a bit, just to make sure everything works, and then you can download a mod or cc file that is confirmed compatible with the latest patches. Test it out in-game; if it shows up, you can start adding more cc into the new game folder.
It's a good idea to test the content out in batches; if one batch doesn't work, you'll need to split and test again until you find the problem file(s). Keep in mind that you might need to replace most or all of your existing cc. Even one bad file can block all of them from appearing in-game, or even prevent the game from loading at all.
If your game won't even load with a clean folder, please post your computer's specs here, as described in the post below. Please also list the packs you have installed.
https://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-3-Mac-Help-Guides-and-Troubleshooting/m-p/4756624#M4