I installed an onscreen manual for a new Canon printer. When I double clicked I got the message that DVD Studio unexpectedly quitted. Lucky me (I've 10.6.8 on Mac Pro) my wife has 10.5.8 on her iMac. I installed it there and found out that it needed Help Viewer to open. I found it in the Library CoreServices. It now opens. I'm flabbergasted why it was that DVD Studio was selected to open it. Paul Moortgat