The pScene->MousePicking function doesn't seem to work in some situations and doesn't pick the mesh properly.
I have uploaded my exe and C++ source code to demonstrate this. When you move your mouse over the teapot, it should print '*picked*'. It works when you zoom in with the right mouse button, but when you zoom out and the object is smaller, it doesn't detect a collision in the teapot's handle.
http://www.megaupload.com/?d=BASJOTHG