One Library Crashes FCPX

FCPX crashed while I was adjust some audio in a multicam clip. Since that happened, I haven't been able to open the library without immediately crashing the application.

What I've tried:
- Opening from backup
- Deleting preferences
- Delete flexolibrary
- Delete render files within the library

None of them seem to work. I don't even have a project started but it does have about 5 hours of multicam clips of different interviews. I could start over and lose several hours of work, but at this point, I'd like to figure out either a way to prevent it, or how to fix it. If this would have happened on another project, I'd be in serious trouble. I thought that was the reason for having backup libraries?

At this point considering what you have already tried I would suggest using Digital Rebellion's Pro Maintenance tools to try to repair the project/library. I believe they offer a 10 day free fully functional trial if you don't own it. I generally don't recommend deleting the flexoloibrary, but the other things you've tried are common.

I tried that and it didn't work. What finally ended up working for me is that I used a backup library and opened it on an entirely new machine that didn't have the files in place. I was then able to open the library without it crashing. I then relinked the files to a NAS, quit the library, transferred it back to the other computer, opened it up and it worked. Then I relinked it back to my raid drive. Frustrating, but I'm just glad it worked.

For the future :

npassociatesllc.com/

You can then backup every 5min or even less