@redrumloa
Can a something.library file actually cause a crash even if it isn't in use?
No.
Probably you just don't notice the library is in fact used by something. If the library is not used at all, it can't cause any stability problems.
@NightShade737
I copied a load of Libraries onto my UAE setup (not overwriting anything) and suddenly a load of things stopped working and others crashed (things like Execute Command and Icon Info etc). So I think the answer is yes.
Just because you don't overwrite a library when copying libs over doesn't mean the library would not be used on next boot.
So probably you copied some library that the system will open on next boot, and that will mess things up.
