I have the Logitech x520 speakers and Windows 7 x64. Since I've installed the new os, my 5.1 has not been working. Just the main front left and right speakers work, plus the sub.
Under the configuration, it is set to 5.1, and when I run a test, all speakers make the test noise.
I then thought it was iTunes, but doesn't seem like it.
How come my speakers test correctly, but when I play music, only two +sub work?!?! Any fixes for this?