My fingers remain crossed. It appears that I can only add short video clips. When I tried to add a longer one, it gave me an error message that the program didn't have the codec for either mp4 or wvm. When I shortened them, they worked. I'm generating them from Shotcut, if that's any help. It's for a memorial dvd I'm creating about my late mother, with a combination of videos and photos. I wanted non-computer relatives to be able to use menus, and DVD Photo Slideshow seemed to have the features I needed.