I’m confused by this, since I have the same problem. That tutorial by Andrew Kramer is another great one! But it also shows him demonstrating making an environment layer as a background, no other layers but a camera, and the environment is instantly visible. Ours disappears.
(I know he goes on to demo a great alternative later, but you have to use Element 3D)
Does HDR have something to do with it?
Tudor Applen