No more passtrough sound after pauze

Hey all,

i've got an problem i cant figure out my self.

When i play an movie the sound has no problem at all but, after an pauze i dont have sound anymore. But when i stop and start the move again i have dts again

All this on a soundblast live 5.1 passtrough spdif on my macgyver ducttape and coax cable connected on the aux of the soundblaster (gives me nice dts-ex passtrough.. )

Can anyone give me an hint where to look to solve this tiny annoying problem ?

I use Ubuntu 12.04 and xbmc 11.0.


Edit : added some more info