On 17/05/16 09:38, Frank Cox wrote: > On Tue, 17 May 2016 09:29:52 +1200 > Rob Kampen wrote: > >> Tried that - it appears to run, i.e. prompt returns. No change. Logged >> out and back in - no change, still gray. It has reset the background >> that comes up when I move the cursor to the top left and see all the >> open windows. > It's a bit late to tell you this, but the configuration is stored in a file ~/.config/dconf/user so if you back that up before playing with it, you can return to your former configuration by restoring that file. > > Have you backed up your home directory lately? Do you have an "old" copy of that file that you can restore? > removing the ~/.config/dconf/user folder worked - it resets everything to clean install state, so one does have to set up everything once more. I played around again and find that the tweak tool tab Appearance > > Theme GTK+ ==> the select box is where things go pear shaped. If I pick the Oxygen-gtk as the theme for my GTK windows that this makes the desktop background disappear and go gray - busted in my situation. Just another example of this product (Gnome3 on CentOS7) not really ready for production use.