Mouse events only fired once, why?

Questions & Answers
1

I have a plane with a box collider, with which I want to respond to mouse events. (OnMouseOver, Down, etc.)

However the mouse events only trigger once, and don’t work again when I hover the mouse over the plane.

I don’t have an Update function or a Raycast set up. Do I need to?

2

Turn off “collapse” in the console.