Just want to cap this thread out with the solution. Somehow some cache data corrupted itself and kept causing the problem to reoccur even when the project was completely redownloaded or when an old version was reinstalled. For anyone having this problem in the future, the 3 sets of cache data can be found at C:/Users/USERNAME/AppData/. There are 3 files inside of that directory which will each have their own Unity folders containing cache data. I simply deleted those files, reinstalled Unity, and opened the project again.