Saved games not loading on Macs running macOS Sierra:
Cause and solution:
If you have iCloud Drive enabled your Desktop and Documents folders have probably been moved to the cloud during the setup process. This means that every time you load your game it creates a new Sims 4 user data folder as it cannot find the original due to it not being where the game is looking. Please go here for full instructions on how to change your iCloud settings and prevent this from happening. Links explaining iCloud Drive and how it works are also provided in the article.
Using CC/Mods is at your own risk, EA are not responsible for making the game compatible with 3rd party content, the creator is.