Tonight I recorded quite a bit of content and I am having an issue with the sound disappearing once I play the movies? The sound is there when I drag my mouse over the clips, but when I play it nothing is happening. No sound. I've tried adjusting any volume options. I'm definitely an iMovie noob so I'm afraid it's something very simple that I'm over-looking. Any ideas on how to fix this? It's frustrating to be able to hear bits and pieces when I drag over the clips, but to hear nothing when it's being played doesn't make sense.