audigy 2 zs rear speakers problem

i have the logitech 640z speakers plugged into my audigy 2 zs sound card, the front, center and subwoofer work perfectly, but my rear speakers has no sound coming out of it only a slight buzz, it worked before though, so anyone know what's the problem?

That's actually been a common problem with previous versions of the card, this is the first time I've heard of it on the ZS. It's a driver/application configuration issue. So now that you know it's most likely software, you can try resetting the application or whatever you Creative Technicians do.

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