Im working on a project, I was on 2D for a while but when I checked a 3D View the curtain wall frame mullions looks flat. I tried Model View Options and the Graphic Overides. Layering, etc. Nothing Its Working. I copied some elements and pasted on another file and the the curtain wall frame reapperas. I went back to the file and they are flat again. I can use other file because this already have a lot of data o many stories.