PHOTOBOOTH! NO SOUND!!!!

what is going on here? seriously? i've tried to find a trend but i can't. I've come to the conclusion, that randomly Photobooth will not record the sound during a video record. sometimes it records and plays back and other times all you see is your lips moving? what the he** is going on here? i mean i've been having this problem since i got Leopard. why hasn't Apple sent out an update for it? this is so dumb. anyone know how to fix it? or highjack it (trick it to work)-like every other part of the Mac OS.