no audio with dvdlab DVD.

Hi guys,
I made this DVD with video from my handycam, using DVDLab.
At the start of the prject it asked me to demux the mpeg video, so I did and I
ended with the separated video (mpv) and audio (ac3).
For the menus and slide show I used wav background music.
The compilation and all went well, and the DVD played fine on my PC,
but when I play it in any stand alone player, there is no audio in the main movie.
everything else is fine, even the audio in the manus.

Could someone sheed some light on this problem.
I can't find anything on the web.