nautilus won't start after upgrade

[sixpack13]

Hi
did an upgrade to F28 on my brothers box.
All went smooth.

Problem now: Nautilus is unable to start.
did a nautilus -c on command line with user account: nothing

starting nautilus with root account from command line: nautilus starts

reinstalling all nautilus packages doesn't fix it.

Ideas ?

Hint:
after upgrade I run dnf autoremove, but in my sight it shouldn't has (had ?) broken anything, cause nautilus still starts with root account, but even ONLY with root account.
nautilus -c as root outputs the same (errors) as on my box (upgrade from April's beta).

[sixpack13]

...
forgot to tell that I also set up a new user for testing nautilus: nautilus didn't start here too