From the description, Carl may already get an idea what’s happening. When it occurred on my system recently, I wasn’t smart enough to freeze the metadata and assets, as I needed to finish the project urgently. I forgot there is now a duplicate function ;-) There certainly needs to be some major thinking going on when using segmented content, trimming, custom reel sizes, place content at reel# start together. But it should be possible to catch these conditions in DOM, I guess. - Carsten