I assume this is grsecurity related, I can test non-grsecurity later if required.
If I try to add a user (so I can show the Librem 13 at a conference without logging in as my user), I cannot unlock the settings:

Furthermore the screenshot showing gnome-user-settings is not able to upload to this ticket

"Upload Failure"
Screenshot from 2017-03-24-13-41-00.png
Exception: No configured storage engine can store this file. See "Configuring FIle Storage" in the documentation for information on configuring storage engines.