Thumbnail shows deleted frame in iMovie 3 and 4

The thumbnail image in the clip viewer is the same as it was before you trimmed the first frame.
This can occur in iMovie 3 or iMovie 4 after you do the following:
  1. Drag a movie clip from the Clips pane to the Clip Viewer.
  2. Trim off the beginning of the clip in iMovie monitor.
  3. Empty the iMovie Trash.
  4. Quit iMovie.
  5. Open iMovie and open the same project.

Even though the thumbnail shows the incorrect frame, the movie plays back and exports correctly.

Tip: This symptom does not occur if you don't empty the iMovie Trash.
Published Date: Feb 18, 2012