After updating to 4.2.1 I don't get overlap events for my characters

I have a sphere component attached to an enemy. When the player character enters the sphere the enemy is supposed to run away.

This had been set up by using the begin overlap event on the sphere and checking to see if the overlapping pawn belonged to the player.

This was working great in 4.0.2, but after updating the project to 4.2.1 I can’t get the enemy to fire an overlap event to save my life. It won’t fire any overlap events.

Anyone have any ideas?