When I was running mate on another computer, I would log off or shutdown, and power up and login again and mate would restore all the gui apps in all the workspaces. Gnome does not do that. Also, I do not have a way to upgrade to Centos 7 because 1. graphic installation fails (as I have posted here before). 2. I do not want to do text install because it will clobber my existing partitioning scheme and does not provide for modifying the automatic partitioning scheme.