I suddenly got this meesage 2 days ago and it happens whether I use Gnome-Shell or Fallback. The message can be closed by pressing Alt-F4 and you will see a normal Gnome-Shell/Fallback desktop but Gnome-Settings-Daemon will not be running as it crashed with a Seg Fault leading to this error message. A possible work-around is to switch to a TTY BEFORE logging in and removing the ~/.config/dconf/user file allowing a normal login. However, this means all changed settings have been returned to defaults. There does not appear to be any particular program that is responsible, but rather the dconf/user file becomes corrupted when a setting is changed. Changing a setting will work but you cannot login again without this error message unless you remove the dconf/user file. After logging in, as suggested above, you can change any setting you like in dconf, by any means you like, and the next login will be a crashed G-S-D, e.g. Touchpad 'tap-to-click' or changing the desktop wallpaper. My workaround includes a bash script that includes all settings I would normally have (using gsettings or dconf to set) and running that during startup. As an extra note, if you remove the dconf/user file and leave everything at default settings, Gnome-Settings-Daemon does not crash on subsequent logins.
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