A strange thing has happened. A saved video I've been working on now opens with a black preview screen and, most diconcertingly, no clips visible. The only way you can tell that this is not an entirely new project is because below the preview screen it still displays the length of my video (5:58 minutes). 

Can anyone tell me what has happened and how to restore my project? I would hate to lose the work. 

A strange thing has happened. A saved video I've been working on now opens with a black preview screen and, most diconcertingly, no clips visible. The only way you can tell that this is not an entirely new project is because below the preview screen it still displays the length of my video (5:58 minutes). 

Can anyone tell me what has happened and how to restore my project? I would hate to lose the work.