In a Festival in June I will see among others: The Black Keys Volbeat Franz Ferdinand Pixies Deaf Havana Skindred sadly I didn't get tickets for the Wacken festival :( (It's a very well-known metal festival in Germany. It's supposed to bequite famous internationally, but don't know how much, so just fyi)
same happened to me some days ago, seems the Boston Pack Update + having custom songs somehow caused the problem. Only solution is overwriting the corrupted save file and make regular backups in the future