VC/2D sound?

Hey guys i just reinstalled fsx with the service packs and my payware and i noticed inside the deafault planes the sound was messed up. When i am looking foreward in the cockpit(and 2d) in planes where the engines are behing the cockpit, i can hear nothing, but when i turn the view so it looks out to the side i can hear it(jets). In the vc(2d works, also facing foreward in the vc i can hear it) of planes who's engines are beside me or in front of me, when i look twords the back of the plane i can't hear anything(props)
A sound cone issue mabey?
A sound cone issue mabey?