My file crashed. When I tried to recover it I get a screen that says “Libre Office Community” and flashes something like “synchronizing repository for bundled extensions” and my book file won’t open. My book of three years won’t open. The flashing so far has continued for about 12 minutes and I am going to have to stop it.
Try resetting your user profile.
Please test with a clean profile, Menu/Help/Restart in Safe Mode