Windows 7: 5.1 speakers but test signal only on 2 speakers

I have a Creative SB X-Fi Xtreme PCI-Ex, and Logitech Z-5500 5.1 THX speakers.

All speakers work; all software, drivers and codecs are up-to-date.

Recently I noticed that in the Speaker Setup screen, the test button only results in sound from the left and right front speakers.

I checked because after a VLC update, mkv files no longer played correctly in the 5.1 mode. Music played, but the voices were muted (while no speakers are muted, and all are connected). I have to select "2 front, 2 rear" Audio Device in order to hear the speech as well.

I have the same problem when playing movies in PowerDVD, where I have to select the 2-speakers setting in order to hear all the sound.

Note:
- Previously the test button did sound all 5 speakers
- The test button on the Logitech remote still sounds all 5 speakers



I have Windows 7 Professional, 32 bit.

Any suggestions?

Hello and welcome Dutch mate I have a Xonar card in my machines and it has a control GUI a bit like the Realetk HD control so has yours not got a similar feature?

Yes it has mate http://support.creative.com/Products...i+Xtreme+Audio

http://www.google.com.au/search?q=cr...w=1920&bih=955