So, we have a lot of mpg (short video clips) taken on a Sony camera and downloaded to our Macbook. We have always been able to view the video by double clicking in iPhoto. Until a month or so ago. Now the mpg shows 0.00 of run time and when you double click, there's no content there. You can hit "play" but there's no video there. Did we lose the content some how? Please help!