I’ve noticed that in my version of Unity 4.0.0f7, shuriken particle systems pause themselves when they are off-screen (i.e. not in the main camera frustum).
So, for instance, if I spawn an explosion behind the camera, then after a pause I turn the camera round, the explosion only begins playing as it comes into shot.
I assume this is a way of conserving CPU time as off-screen particles do not get played. But is there a way to turn this “feature” off?