Logitech G35 Problem

[saXoni]

Hey guys. For christmas I got the Logitech G35 headset as a present. It works great, until I start using mumble. While ingame, I can only hear people on my right ear, no matter where the person is standing (left side, front, back, right side).

I wonder if anyone has the same problem, and if there is any way to fix this annoying problem.

Thank you.
saXoni.