It seems that you guys misunderstood the issue. From my understanding, Brahim Salem mean that the alert sound not working(i.e. sound effect that is played when alert is popped ), instead of preview of sound not working.
Anyway, I've encountered the same problem.. Alert sound only works in the sound preference dialogue, not working in anyware else. While preview sound works fine for me.
It seems that you guys misunderstood the issue. From my understanding, Brahim Salem mean that the alert sound not working(i.e. sound effect that is played when alert is popped ), instead of preview of sound not working.
Anyway, I've encountered the same problem.. Alert sound only works in the sound preference dialogue, not working in anyware else. While preview sound works fine for me.