Pawn not responding to Add Controller Yaw Input

I’m trying to decouple input logic so that it doesn’t have to belong to a specific character. Towards this end, I have a class I’ve called ComboController which is supposed to receive all input from the PlayerController and then forward it to the player character.

Keyboard input is currently working, however it is unresponsive to mouse input. I have verified that the mouse input event is triggered - it prints the correct values to the screen. It’s the Add Controller Yaw node itself which is doing nothing. Touch events are disabled, so I don’t think I have the same issue as described in other threads on the topic. What am I missing?

Here’s where I initialize my ComboController:

https://photos-3.dropbox.com/t/2/AAAz7tycXD1w-7e8kFuvIlvFRHn10tU0aw_a66QYKPAYPQ/12/293980947/png/32x32/1/_/1/2/Screenshot%202015-09-20%2017.37.21.png/EJGwsZ0CGPkKIAcoBw/KsQ_9n4PWJoUECO_zPK0ZF71XGcEDjjO3US5kpwysvg?size=1280x960&size_mode=2

And here’s my input handling on my ComboController class:

https://photos-2.dropbox.com/t/2/AABkTfptzO-PqDQWbNIZ6UPMhzEAHrIYZ8DrqnwhmFV0vg/12/293980947/png/32x32/1/_/1/2/Screenshot%202015-09-20%2017.37.02.png/EJGwsZ0CGPkKIAcoBw/uZTBCS4J3ajZh_fTqa1VcWaLuNYIwffGlRbIdvOMIWs?size=1280x960&size_mode=2