I am using the PRE10 organizer and an exercise in the Classroom in a book. The exercise calls for importing 13 mp4 clips into the Organizer from Lesson4. The clips are imported into thumbnails but the first frame of the clips are black or missing. Double clicking on the clip opens the clip and it is displayed correctly. The clip opens properly in the PRE10 editor. The exercise in the book on p. 64 shows the clips properly displayed in the Organizer but this doesn't happen on my pc. Other users have duplicated this problem. Your tech support people claim that the Organizer codec doesn't support displaying the first frame of these clips. If i change the mp4 extension to the avi extension the first frames of the clips are properly displayed. My own avchd lite clips are displayed properly in the Organizer. This problem only exists with the Adobe Press Classroom in a book mp4 files on the dvd in Lesson 4. Can you fix this problem?