A little interesting (and irritating) FYI about the object libraries:
If you add an object to a library, then later delete the object again; it is still going to take up the same amount of space in the library file.
In other words, deleting an object from a library doesn't really delete the object. The file size will continue to grow, if you are deleting and adding to it. Once it hits 2GB, 'bye 'bye...

Solution: ALWAYS make new libraries for your stuff.
Don't use your preset 'user', or any other, libraries to store new objects. They will continue to bloat up, and if you don't have backups, will become unusable eventually.

Friends don't let friends use booleans.