Do you have these horrible shadows under your Sims since downloading the Discover University patch?
You can get rid of them in several ways like enabling laptop mode or disabling post processing effects. My preferred method is to edit the GraphicsRules.sgr file as it does not affect any other graphics settings. You will need to apply this fix after each patch update as the file will be replaced (or until EA fix the problem):
Right click on the game in your Applications folder and select Show Package Contents
Navigate to the Contents folder then open the GraphicsRules.sgr file with TextEdit
Hold down CMD and F to bring up the search box and enter SSAO
There should be four results of SsaoEnabled that come up
Make sure the value next to it is false for each instance: prop $ConfigGroup SsaoEnabled false
This issue has been quite prevalent since the August 2019 patch. We have a thread running on it over at Answers HQ here. When the user tries to access the gallery and/or their Library the game will freeze but more often than not, crash.
SimsQARobo has helpfully suggested accessing the Gallery through a web browser but there does seem to be another fix which is working, it involves trashing a game file, EAWebKit.so, which rebuilds itself after a game repair.
Right click on the Sims 4 in your Applications folder and select Show Package Contents
Navigate to Contents > Frameworks
Drag the EAWebKit.so file to the Trash
Open Origin, right click on the game in your Games Library and select Repair Game
The file will be recreated after the repair and you should now be able to access the Gallery and your Library again.