Yeah, came back here to post that I did the same thing and it worked: moved all the app data stuff, launched the game, then copied only the save files back in. It also seemed to fix the issue of the game freezing at 80% whenever we reloaded a save mid-session
What do you mean by "All the app data stuff"? Because all AppData is connected to your whole computer, not just your BG3 folder. Can you clarify what exactly it is you moved/deleted?