OnComponentHit not firing against BlockingVolume


I have just started using UE4 having watched each of the tutorial videos; on my first setup, I am unable to get the OnComponentHit to fire when a physics enabled sphere goes past a physics collision enabled Invisible Wall. It just runs through it.

I have attached the screenshots of the Blueprint and main window below. If there is a more appropriate way to detect a collision between an actor and a wall, please let me know :slight_smile:

Thanks in advance,

Well, that was resolved. The position of the wall was not as it looked to be (is really tricky to navigate on the Mac).

Is it possible to set or see the location of a blocking volume? I can see the size but not the location.