Editing Issues

Having begun the editing process our Music video straight after our first film day everything was seeming to be piecing together and editing was going quite smoothly. However, today we attempted to upload some footage of a a piano scene, but instead of importing it like we usually do this time we accidentally dragged and dropped the footage into a new event. iMovie has now been stalling/configuring for approx. 2 hours but the lesson is done so hopefully when we come in for our next lesson it'll be up and running again.