I have never had this problem with V4, but there's a way to handle the shaders that might be a workaround. Load all your textures on the figure, then grab that colorful "multiple shading domains" sphere at the top of the list. With the shaders tab open in the browser, drag and drop the sphere into your shader library. Next time you load the figure, go to the shaders and drag that shader back to the multiple domains sphere for that figure.