OGG audio

[Fabrytnix]

I have two PC one desktop with WIN 2000 PRO and a laptop with XP PRO.
I've ripped my first film with vorbis audio stream encoding it with HeadAC3.
I've encoded it in 6 channel format.
With an old version of BsPlayer and OGGDS 9.9.1 i can hear perfectly my film with desktop, with laptop i can't hear voices (may be the central channel), i've installed 086.494 version of bsplayer and OGGDS 9.9.5, the last, i think.
But nothing is changed.
UsingWinamp 2.86 on my laptop, i can hear perfectly the ogg audio stream created.
I've multiplexed audio and video streams with oggmux
:?
Any ideas?
TNX
Ciao
Fabrizio