https://bugs.freedesktop.org/show_bug.cgi?id=62889
--- Comment #8 from Alexander von Gluck kallisti5@unixzen.com --- Thanks for the input.
I disabled colortiling and installed xfce.. success!
It seems like Gnome 3.6 won't work unless color tiling is enabled. I double checked the gnome session logs and don't see the previously mentioned error anymore.. just a blank desktop wallpaper across both monitors. I erased the gnome config files in .local without any success.
I ran a glxinfo from .xinit, and it does confirm that Gallium is in use. (attached)