The SDK versions are configured a certain way - with CEGUIBase including the Minibidi code for bi-directional text support and what have you . Also, the 0.7.1 SDK (the one from february) is not built against Irrlicht 1.7.1 (because it wasn't released then), although the newer snapshot releases from the v0-7 branch are. I'm not sure if I had enough info to have told you this previously or not, if I did, I apologise for any confusion.
It's good to know you now have it working

CE.