Comment 1 for bug 811118

I'm not sure why EESchema crashes but I can tell you the reason it works when logged in as root. You are trying to modify a system library installed in /usr or /usr/local. You don't have permission to write to any files in these folders unless (in your case) you're running EESchema with root privileges. I can't duplicated the crash running 64-bit Debian testing. In my case EESchema gives me a warning that it cannot write the library file when I attempt to change any the system libraries. In any event, all of the Kicad applications should warn you when you don't have write access to a file rather than allowing you to edit the file.