The iMovie has taken months of work for my class.It played brilliantly on Friday - but when I opened it yesterday for a final check before export a few of the sound clips had moved/overlapped - when I tried to correct these it the iMovie stopped working. It appears in the project page - but only as a black page. When I click on edit - the storyboard appears (all clips etc)- but again no image in the large screen in the middle. It won't let me do anything - I created some other projects - as a trial and they all work. Please can someone give me some step by step advice on what I can try,