House Wizard in Pro 7.0

[Kilgore Trout]

That depends on whether the windows in the plan have their material set to "use default" or set to some material. When you first place a window into a plan, the materials are set to "use default". If you change the default material, then all the windows in your plan will change. If you open any window in your plan and change it's material to something other then "use default" then it won't change. If you use the material painter (or spray can) on a window, you are changing the material and it won't be set to "use default" any more.