I am new to all of the programs. I made a video with the Replay Media Catcher and saved as an AVI file. I then tried to cut the video down with a marker in the beginning and another near the end. I then made sure the part I wanted was highlighted and hit the Trim button. The program then seems to indicate that the new shorter video is being saved. But there is no real change in the video. Why won't it trim the video I selected??