I upgraded my quicktime recently and now I don't have sound when viewing quicktime movie trailers. I tried uninstalling it and reinstalling and then using the quicktime alternate program and nothing works. I have sound on all other types of files, i.e. music with winamp and other web videos. I tried to uninstall my soundblaster audigy sound drivers and reinstall them and that didn't work either. I saw several people had this problem when I googled it, but no one has figuered out how to fix it so I though someone here might be able to help. Thanks.