I have this problem with a curtain wall. As you can see in the pictures, although I've changed the settings for all frames to have an anthracite texture, for some reason the overrides are not applied. I've also tried to change the building material altogether with no success. It seems to be some sort of global override at play, which I can't find.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.