No center channel

I just hooked up my inferno to my receiver with 5 speakers (no sub). I am getting no sound from the center channel speaker. The receiver will send a test tone to all speakers just fine. In the inferno audio config menu, clicking on each speaker produces a response except for the center channel. I have tried reloading software. Any ideas?

Update

I found that my center channel and subwoofer channels are swapped. This is very odd as I am using optical connection.

Depending on which driver

Depending on which driver you're using, there may be an option to swap the Center/Sub signal in the main page of the control panel.

Can't find the option

I'm using the latest version of drivers and I don't see that option.

Hi Timothy, Which OS and

Hi Timothy,
Which OS and audio player are you using? There may be options to switch the Center/sub signals there also.