Can't disable drop shadows from network elements

[indigo423]

When I've used the shadow_style=none setting I still get drop shadows for the networks. See the example below:

{
  shadow_style=none;
  network dmz {
      address = "210.x.x.x/24"

      web01 [address = "210.x.x.1"];
      web02 [address = "210.x.x.2"];
  }
  network internal {
      address = "172.x.x.x/24";

      web01 [address = "172.x.x.1"];
      db01;
      app01;
  }
}