I actually figured out what happened. When I first started a save, it didn't freeze up, so when it did freeze up I thought it wasn't working. But one time I left it running after it froze up and It worked, and then I realized I just had to wait.
So whenever I try starting a game with this database, FM18 freezes up. I have version 16.3.0 and I don't have any other databases selected. Any idea on how I can solve this problem?