I'm also having this problems and it's extremely frustrating because it's inconsistent. Sometimes, I have no problem seeing the attenuation spheres rendered into the Scene View. Other times, no matter what I do, it will never be drawn. It doesn't seem to have anything meaningful to do with what version of Unity or Wwise is being used. It will just... stop working. And I have no idea what makes it work again. Please help, this seems like a very basic thing to have break down in the Unity integration.