In the Origin app, right-click on the gear icon next to the Play button and select "Repair".
I wasn't having any problem with the November 2020 update, when the patch was released today (Nov 17) however, my game doesn't leave the loading screen. It will load and open the main menu but when I click on a saved game the loading screen comes on and then that's it. It just loads. I sat here for 10+ minutes multiple times waiting for it to load and it never does.
I'm having the same issue.
I also can't play a new game past the create new household screen.
Please can you provide more information about your Mac. Instructions on how to do so and what to provide here - http://answers.ea.com/t5/The-Sims-Mac/READ-FIRST-Sims-4-Mac-Help-Guides-and-Troubleshooting/m-p/4612396/highlight/true#M162
