I just tested with this sample that switches 2D -> 3D and back, and it works the same with the CDN and the downloaded API (except for a minor issue with the stars.wsv): ArcGIS API for JavaScript Sandbox
I just tested with this sample that switches 2D -> 3D and back, and it works the same with the CDN and the downloaded API (except for a minor issue with the stars.wsv): ArcGIS API for JavaScript Sandbox