I've looked at it but I'm not sure if it is a bug. You can see though the 'table object' because the camera can be placed inside of it (you need to make sure that the camera does not enter solid objects). The cliff wall is a model so 1) you are not going to get good collision on it (it uses a bounding box) and 2) the 'near' plane of the camera is going to clip any polygon it encounters so the closer you get the more polygons get clipped (this is the same problem Fink is having with his cube). You should really replace this with a map entity.