Cannot change Date&time settings, there is no response toggling "Weekday", "Date and month" and "12-hour" or "24-hour".
Cannot change Wallpaper.
Cannot change "Turn screen off when inactive for..." in Brightness and Lock. There is no effect after selecting a different value and it is still "10mins" when reentering "Brightness and Lock".
And if launch any GUI in Terminal, there is "GLib-GIO-Message: Using the 'memory' GSettings backend. Your settings will not be saved or shared with other applications." gnome-control-center is installed and latest version.
I have this problem before, and it occurs again after a clean re-installation. I have glib 2.34 mannually installed for development usage. But I don't meet this problem in company's Ubuntu 12.04 which also has glib2.34 manually installed.
It is wierd that I have not found any similiar problems by Googling. So, can anyone help to fix this problem? Thanks in advance.