I'm having a problem with my default Gnome 3.6.0 setup on 12.10. I used to create themes in Gnome 2 and Gnome 3.0, but I'm at loss to explain why my theme is black in the background. This problem is limited to Adwaita, and there are not any issues with Ambiance or Radience. I guess it isn't a really big deal because I'm going to upgrade soon, but until then Gnome is going to be looking pretty ugly; almost unusable.