Try this. Add an image; the one you want for the thumbnail as the first image in the show (VideoWave) and select a short duration (play with it). . The program should use that as the thumbnail but it will be so short that you won't see it in the video.
As for the second scenario, go to tools, options and delete the proxy files. They will be rebuilt (it may take several minutes). That should get rid of the old thumbnail.
QUOTE (madrona98 @ May 4 2006, 09:35 AM)

There are really 2 scenerios regarding thumbnails of each vidio clip. I have 5 video files that make up one mpeg video. The first thumbnail of the series is black as it is the first frame of that segment. I would like to change that thumbnail to a scene from latter in the clip.
Second scenerio. I take one of the segments, split it and discard the unwanted portion. The thumbnail for the "new" clip retains the thumbnail from the original clip, even though that frame is no longer in the new clip. Again, I would like to change the old thumbnail to a scene that is in the new version of the clip. Surely there must be a way to do this.