Ignore all the below - my post process volume wasn’t unbounded :(:(
I’m getting a strange situation where the is only showing when the camera is in a certain position - in this case somewhere behind the light. If not in that position it vanishes. I’ve tried restarting the editor and I have exposure control off. In the pic you can see that in the middle shot it’s there and then in the other two positions (which are very close) it’s not.