iMovie 3: Loss of Volume Settings on Export

Custom audio volume settings in iMovie 3 projects may not be saved when exported to QuickTime or iDVD.
Symptom

After adjusting the volume of a clip or audio track in the iMovie timeline, the exported movie does not include these changes. Instead, all tracks play at full volume.

Solution

Update to iMovie 3.0.3 or later. It is available from the iMovie website (http://www.apple.com/imovie).
Published Date: Feb 18, 2012