I'll try to explain this the best I can:
I am making a movie in imovie 09. I needed to be able to change the video clips while still running the audio (music) in perfect time so that when I cut back it was still in sync so I added the same clip but used only the audio - this worked. Now, when I split a clip and add another clip (exactly the same length) in it's place, the video and audio after the replaced clip do not match - they are slightly off. Why is this happening and how do I fix it. Please help me, my project has come to a complete stop and I just can't figure out why!