Buttons are not working with my GameManager script, after scene load.

Hello, I am making a 2D remake of an old arcade game. In doing so, the first scene creates a GameObject called GameManager. This script is responsible for keeping track of what level the player is on, playing the in-game sound track, exiting the game, and loading between scenes. I am using the new Unity5 GUI system, rigging the button to the game object, and then calling the desired function.

I created a prefab for the GameManager and placed one in each scene, so that i can rig the buttons...

Buttons are not working with my GameManager script, after scene load.