i tried methods in that post as well, with no success. i am a teacher and we are using it in the classroom, and some of my student computers will work right, while some will not. and they are all imaged the same!
that worked, for now, as we are all doing the same assignment needing the same sound (all were making a car and needed a car horn). a real fix would be useful, as the next assignment will be one that they create their own animated objects with whatever sounds fit the objects they choose.