Weird camera movment

https://youtu.be/vWmjydGPOZM

I`m using http://www.blendswap.com/blends/view/66521
However when i move my mouse up and down it goes diagonal ???
The left and right are working fine, anybody got any clue why ?

the dl from blendswap seems to work fine, what exactly are you trying to do, are you running any other scripts on the camera?

This sounds as the controls or vertical mouse movement are connected to the “camera roll” (however that is called in this demo).