Currently Being ModeratedMar 22, 2013 11:16 AM (in response to carrieandrowan)
Are you using iMovie 09 (Version 8.06)?
If so, are you using any speed changes? Fast or slow motion? If so, there is a bug when you use a custom speed change like 58% or 139% that will cause random audio artifacts.
The fix is to change all speed changes within your project to one of the pre-sets such as 25%, 50%, 75%, 100%, 200%, 400%, ETC.
Currently Being ModeratedMar 23, 2013 7:03 AM (in response to carrieandrowan)
I've had similar problems. Do you select multiple clips at once and try to mute them? This always created that problem. After I individually muted them the audio would be muted. Try deleting the clip and dragging a fresh version of that clip into the timeline and mute it. Sometime's iMovie's cache isn't on top of things!
Best of luck!