Corrupted library

Hi everybody
I'm editing a 52' documentary for FrenchTV. Library with managed medias on a DDP Server and auto backup in local. Everything was fine during the 4 first day of editing and this morning I was unable to open the library. (It began to open the event and at the end of the scroll bar fcpx crash).
"Not a problem" i said to myself, i've the automated backup. I open the last one and the same thing occur, another before, same thing ! "Oops, problem" i said to myself. :blush:
I've deleting the preferences, deleting the Currentversion.flexolibrary and the Settings.plist, same thing.
I've made a copy of the original library in local storage, same thing, fcpx crash.
I've disconnected the workspace of the server with my external medias (if it was a corrupted media issue), open the original Library, and fcpx crash again. :S
I started to eat my fingers, and try to open with the other hand (external medias disconnected and hiding the original library) the last autobackup and ... YES everything is here like yesterday evening !
So my problem is solved but i wanted to share my experience and ask if someone has already encountered this problem.
So if i resume, to solve my problem i've had to hide the original library in order to open the backup from my local storage.