Seems like I'm not the only one having issues...
I gave up trying a few months ago after the Sept update and finally had time to try again tonight and it's still not working. It forced me to reinstall the EA app to play.
I don't use mods. Newly installed EA app and The Sims 4 base game as it couldn't load Sims 4 without it after the reinstall of the app and now it us unusable. It will load the menu but the menu looks funky and none of the buttons are functional. I can't even close it without ctrl+alt+delete to force it. This is the only game I play and I can't use it anymore. I might try a different PC later but I've already maxed out my data plan for the month re-downloading the fresh base game so.... probably not any time soon.
Windows 10, 1tb hard drive. Always ran smooth in the past. Can't figure out what would have changed on my end.