For some reason I can't change the window border theme under GNOME-Shell. It seems to be stuck on the Ambiance theme. Most themes I try to use simply don't work and don't change anything or when I log back in my window borders look like Windows 2000. I'm on Ubuntu 12.10 with GNOME 3.6. I read something about themes for 3.4 not working with 3.6 and vice versa, but I have tried a lot of themes with the same results.