How do I get my proposed terrain to show up in the same view window as my cross section and my vertical alignment?

Also, does anyone know what cached geometry means? Because I keep getting errors that say I may have outdated information, and I don't know why. It says my data is from a cache that can't be found...?

And is it normal to have two 3D models of the same name?

Also, does anyone know what cached geometry means? Because I keep getting errors that say I may have outdated information, and I don't know why. It says my data is from a cache that can't be found...?

And is it normal to have two 3D models of the same name?

That looks like that Default-3D model is attached twice. Since that's the reference dialog, you don't have two models with the same name, you have one model attached two times.

You may be seeing this if you have a 3D Cut in a profile view. Either refresh the 3D Cut or delete it if you don't need it anymore, and that warning will likely go away. 

Thanks. I think that was the problem.