Thank you for answering
I am using Pte 9.(I see that there is a Pte 9.0.16 but each time I try and do an update they ask me to pay. I thought that updates were usualy free?)
The photos are not mine . I am doing the diapo for a friend. Her photos are 12000 pixels wide and 9000 high Resolution 300. All her photos are that size and out of about 40 photos only 5 are black and I have found that it is the same even if they are not zoomed! A friend suggested they were currupted some time when moving them?
The interesting thing is that it does not happen if I make an AVI so I have solved my problem for the moment. But it would be interesting to know why? It seems to be an MP4 problem.
Elaine