"the 3880 does not have the capability of switching from MK to PK and back again via the selection of Media Type or ICC paper profile. You must do the switch manually at the printer console."
As usual I am a little confused by the above statement. My photo black & mat black change automatically depending upon the media type I choose. If I am reading your statement right it is not supposed to be doing that. If I choose for instance premium luster or glossy the driver chooses PK, if I choose any mat paper it chooses MK. I also can't change it at the driver level the option is grayed out.
Sorry for highjacking your thread Gary, but I had to ask as I am new as well.