I created the following world using only the brick box, and saved it as an .sdf file:
I then exited gazebo and ran:
gazebo-8.1.1 -u /Users/athundt/model_editor_models/brick_box_world/brick_box_world.sdf
This loaded the following world, where the brick wall clearly differs from the world I saved:
I've attached the saved file
brick_box_world.sdf. This was done with the gazebo 8.1.1 default homebrew installation on OS X.