No sound in mp4 files
 

Hi,
All my mp4 video files start with no sound in BS Player. I always have to go to the options Audio -> audio streams -> play all and only this works. I´ve already tried to select streams 1 to 4 one by one and nothing, I´ve tried to select them all in option "choose streams" and nothing, only "play all" works.
This only happens with BS Player, other players play the mp4 video with sound at start.
I have the lateste version btw.
Doesn anyone have any clue why is this happening and the solution for it?
Cheers,