Cant Detect dts Audio automatically - Pls Help

I bought WDTV live a month before every thing was good so far but it cant detect dts audio automatically. I use Optical out for audio and my AV receiver is Onkyo 5405. pls help

Can you give us more information? You can reproduce the DTS audio, but you need to manually change the settings in the WD TV or you need to hit the options, while playing the movie and choose the audio track with the DTS?