When changing the board stock on selected cabinets in custom layout that have a conestoga door/Drawer front that is set for alternate source. The material for these doors and drawer fronts will not change when the check box to change material on default door and drawer is selected. However If the default door/drawer front on the cabinet is a thermwood door/drawer front and is set for alternate source it will work.
One thing that I did notice now is that you can select all the doors and drawer fronts on a cabinet and texture match them to the box material. I don't think that was available before -- but I haven't sued that in a while.