wall framing disappeared

[Davaco]

Per advise from tech support, I created parapet walls above a single story building with short walls on a second floor. Specified those walls as solid railings. When I used the eyedropper to apply a stucco material to the top rail of those walls, all the wall framing in the plan disappeared in 3D views. (except perspective framing view) How do I reverse this? I didn't notice this until after numerous other operations. Apparently, undo is not sequentially retroactive. As I was just finishing last details of a model, I am surprised that I could make a global change without warning. Especially when advised to do so by tech support. Any help would be greatly appreciated.

David Stewart
Chrysalis Living Designs
HD Pro