@RyanFelisCatus That means that the problem is one or more files in the Sims 4 folder you moved. The next step is to test those files, at least the ones worth keeping. Start with your Mods folder; you can see a list of mods and cc currently known to be broken here:
For anything not on that list, you'll need to test it yourself. The 50/50 method can make going through a long list of files much more efficient.
https://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content#The_50.25_Method
Once you've done that, you can copy over the contents of saves, Tray (saved households and builds), Screenshots and Recorded Videos if you care about those, plus the UserSetting.ini file (login rewards). The rest can be discarded.
