I really like the blackbird theme on XFCE, but I cant really use it because it only turns some of the backgrounds to the dark grey/black. Sometimes I get the light grey text over a light background, this usually happens in search fields or Ubuntu software Center. The weird part is, only some text is light grey, and some of it is black. Any idea of how to fix this? This theme has never worked, straight from install, on both 12.04 and 12.10

(I know this is GNOME 3, I'm messing around with it, but the symptoms are the same)