Mouse Axis (X/Y) input always 0?

I have copied the Third Person Character blueprint asset (from the starter project) into my main project, because I need a simple orbit camera (no movement, only rotation, no local character mesh to look at). I have set the mesh to [None] and made it invisible, then added a Spring Arm component with a child Camera Actor. I have added zoom functionality to this, via the Mouse Wheel Axis event. The zoom event fires perfectly fine whenever I use the mouse scroll wheel…

However, for some reason the Mouse X and Mouse Y events never seem to spit out what my mouse is actually doing, and instead, is always 0. I have double-checked all of my settings, comparing them to the starter project, and most everything appears to be identical… So what could cause this to happen?

Figured it out:

http://i.imgur.com/5fieUNe.png

Can you please convert that Comment to an Answer and accept it to close the ticket thank you.

Done & done