I have several images within a single placeholder and they each have a set duration. When I preview my presentation, the images stay up for the appropriate time. However, when I see my presentation in the display, the image stay up for far too long. They stayed up for too long even after they should have been cached (we watched the presentation multiple times), so I doubt it is an Internet connection problem. I have other placeholders with different timing in the presentation--could they be interacting and messing with each other?