I recently upgraded to El Capitan, and have been having issues with iMovie ever since. If I place a still photo in my iMovie project, the photo shows up on the timeline but won't play. It shows in the video as a black screen. I've tried placing it through the media browser, dragging and dropping from iPhoto or Photos, exporting to the desktop and dragging it from there, and saving it in Preview first then dragging and dropping, all with the same result. I also tried deleting the plist file and rebuilding the photo library, no good. Can anyone help me? I'd really like to finish my project.