Solved
Sims 3 64-bit whole screen flickering after Mac OS update
I downloaded the sims 3 about 3 weeks after the 64 bit update and, as everyone else has already found, had some issues with it. I started new games every once in a while to try and see if it would fi...
@soph4332 As an experiment, try turning down the lighting and trees settings to the minimum. (Do so at the Main Menu, then quit to desktop before loading a save.) If that doesn't help, test in fullscreen or windowed mode, whichever one you haven't been using.
If neither of these makes a difference, please attach your deviceconfig.log to a post; it's in Documents > Electronic Arts > The Sims 3. You'll need to manually open the folders; the file won't show up in a search. You can delete your user and computer names, about 25 lines down, but there's nothing else in that file that can identify you.
