I'm having the same problem. Went from 2018 ver to 2020. Had a chat with Chase and referred him to this topic. He didn't have any suggestions
except to call back during earlier hours for the tech people to look into it. I did the clean up, no help, and I don't have several of the folders that MusicStudent showed in their post. Mainly the BIABsongs folder. And I did a "typical" locations install, nothing custom.