I created a blueprint with a simple Widget Component. With “User Interface” > Space = World.
The mouse cursor doesnt seem to line up correctly with blueprint in the world. Click events and Hovered Events are not being fired when the mouse cursor is directly over the UMG Button. But if I move the mouse cursor away from the button, to an arbitrary location the Click and Hovered Events fire.
After doing a bit of digging I was able to find that this is a known issue (UE-20777) and that it has been submitted to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.