Just to add I've managed to download the Basset/Carnkie example you produced. Got the pro add on. Haven't worked out yet how to stop it at any particular point.
Malcolm,
OK that's good. Open QT and movie go to Window (in bar across top) Select "show movie properties" then select "Presentation" from the tabs
At the bottom you will see "Movie Controller Type" and none movie controller in the box, use drop down box and select Movie controller. Lo & behold the slide controller will appear below the movie. Just grab the slider tab and once loaded in RAM you can slide the image transition back and forth to your hearts content! When you close save changes and it should stay there for the next time.
Peter.