Optical out problem: no sound with DVDplayer?

Hi,
I've got a problem with the optical output of my MBP. When I play a DVD with the DVDplayer app or VLC my receiver doesn't detect the optical signal from the MBP. I think this is a software problem.
I say this because all the hardware I use seems to work fine:
1. My receiver/amp detects the optical signal from another DVD player device with no problems.
2. The optical cable I use with the MBP is the same cable as a use with the DVD player device (with the mini jack adaptor of course).
3. When I insert the optical cable into the combined output of the MBP and I launch DVDplayer app, you can see the red light comming out at the other end of the cable.
4. I've set in Audio/Midi app the digital signal to all possible combinations (44,1 kHz, 48 khz with 16, 20 and 24 bits)
5. Trashed prefs of systemaudio, DVDplayer and Audio/Midi app.
But it still doesn't work. Anybody knows what I can try?
Thanks.

Will iTunes play through the amp?

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