I was checking out the LensFlareSystem, and it seems the playground example doesn’t work? On my machine at least the lens flares are not moving around with the camera: https://playground.babylonjs.com/#TQ67L1#5
It works at my house. It is surely a problem linked to your machine as you say.
User error! I think it is working. I needed to pan the scene (not just orbit the camera) to get the effect I was expecting.