Hello I am running a fresh new 9.04, and blender sound is all broken.

i have noticed 2 problems:
- when clicking the sound block and mixdown button (to generate a wav file of the full sequence) the wav file does not produce any sound
(yes i have clicked the speaker button to activate the sound )
- playing some sound in the sequence window produces distorded sounds.

Does anybody succeeded to play/export sounds in blender with 9.04 ?

Thanks !