Thank you Pat.
I have just created a new blank document, drawn a structural member and applied a texture by class. It worked...but. As soon as I move the object in the plane, the texture disappears and can't be applied a second time, I mean not at all, not even with a new class.
And I had reinstalled the VW 2025 a couple of hours ago, because I thought there might be some issue with the update.
Boh. I can only think of a conspiracy by some Nazis.