Try as I might, I cannot upload video to 'show and discuss'. For the third time I have a green screen with audio only. I carefully followed John's advice, particularly with regard to deleting any blank space. I still suspect this is where the problem is. I left click at the end of the movie where there is a green line to the right of the marker, this deletes the green line to the right and it is replaced by a green line over and above the movie (i.e. to the left of the marker) I assume it is ok to leave this green line over the movie. At this stage I upload it, only to get a green screen again! It's the 'movie' (or is it non-movie?) called 'How to skid in Snow'. It's another masterpiece lost.