Sim Guru Nick also said that a save's size also influences the number of saves that can be made to the library. According to him, since lot saves are larger in size than household saves, if you have more of those you'll most likely have less total saves in your library. I've since begun playing my game & am pleased to see that those corrupted blue saves are gone & now have an explanation & temporary resolution for the saves deleting themselves. Also the addition of the 'my households' category can help take the place of the library for some households (depending on how you like to play).