Hey friends, This problem flummoxed a very patient Genius today (who advised me to reinstall iMovie, or just buy the new iLife), so I bring it to you all here: On my new MB, I've had this problem with iMovie transitions since the beginning (last October). Anytime I add a fade-out (or other transition), the audio cuts off abruptly, and is replaced with some kind of looping audio clip from the preceding transition. It sounds pretty bad, and I have no idea why it's doing this. Here's a very short example of what I'm talking about. You can hear the applause disappear as soon as the little girl hugs me, replaced by some piano notes from earlier in the clip. So weird. Any thoughts would be appreciated! Thanks folks.