Getting Cinnamon Dialog Box in Ubuntu 12.04
 

I have Ubuntu 12.04 installed. As a newbie, I followed instructions to load the Cinnamon and Gnome desktops for comparison purposes. After comparing, I decided I prefer the default Ubuntu desktop.
My problem is, when I want to change my wallpaper now, I now ALWAYS get the Cinnamon dialog box, not Ubuntu's. I have verified that I am choosing Ubuntu @ login, but I still get no Ubuntu options.
Should I just uninstall Cinnamon & Gnome?

I Just Gave Up
 

I coulnd't resolve this issue, so I just gave up and removed Cinnamon. The issue went away.