I have now got my Lion all up and working, and I am truly amazed by this build! Thx to all the great posts on this brilliant forum! After reading up and down for quite some time I need to send this post. Quicktime will not play any videos. If I try to doubleclick the mp4 or mov file i get -101 error. If I open them from QT , QT freezes. When I try to play any soundfile in iTunes it will not play. VLC player plays all files. ...but I cannot hear them since my system cannot audio....... Thx for any help!!