@CentraMagik A couple of screenshots of the black pixel squares would be helpful. You can put your game in windowed mode (cmd-enter) and then use cmd-shift-4 to capture the section of screen you want to show.
Please also 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.
I don't know how to find the config log, but I am currently on a MacBook Air (I don't know what year), and am running High Sierra.
Still the same issues and EA haven't been active since the first update. I think they've abandoned us lol
