Ok, I think I figured out a work around. I applied the stone texture through the OIP, but then went back into the class settings for the column and changed the column base to "column class" and changed the column shaft to a new class named "column-shaft." That seemed to do the trick (see attached). However, I still agree you Horst, that it is a bug and we should be able to change the way the textures are applied for the individual classes of an object, like you can for a 3D modeled object.