I have some videos taken on my iPhone and imported into iPhoto. I am trying to move the videos from iPhoto to iMovie. All have a .mov file extension. About half of my videos are importing correctly. The other half are importing completely green. I'll have a 30 second clip of just a green screen, even though the video is playing properly in Iphoto. I'm not sure why this is happening or what I can do to fix it. I'm running 10.11.2 and iMovie version 9.0.8. Any ideas what might be happening? TIA!