Movie problem

When I scrub the timeline, my pictures fade in fine. However, when I preview the movie, there’s only sound - no pictures. Anybody know what the problem is? I thought it had something to do with the folder the two layers were in, so I took them out of the folder. They are also at the top of the layers, so there’s nothing to get in the way. ??? Thanks to anyone who might know…

I must have accidentally moved the stop action on the actions layer to the first frame… Details, details…