I am trying to make an hour long movie by moving clips from the clips pane to the movie track. I had about 62 minutes worth of movie on there and then proceeded to edit/delete bits of it, eventually reducing the movie to about 52 minutes. Now I want to add more of the clips from the clips pane but when I try to add more, the end of the movie overlaps with the start. I seem to be limited to 52 minutes now. I have emptied the trash frequently and the Free Space bar tells me there is still 13 GB of memory available.What has gone wrong? Why can I not complete the project.It is very frustrating. Even if I trim another clip or two from the movie I still can't add any more clips without this overlapping occurring.