Weird... today I'm able to reproduce it with "gksu pluma" again, 100%. I'm out of clues :-/
- Bug#732209: unable to create file '/run/user/1000/dconf/use... Vlad Orlov
- Bug#732209: unable to create file '/run/user/1000/dcon... Miklos Quartus
- Bug#732209: unable to create file '/run/user/1000/dcon... Vlad Orlov

