Hmm....what kind of art program you have?
And when you are done making the height map then save it to {map's name}terrain.png and Make sure it's save in the terrains folder then go to feralheart and then map maker and then try it in map maker.
And about the meshes, the pine leafs are really pine trees, not acacia tree. If not, then try retexuring them back to their normal tree texture.