On what computer operating system is your Premiere Elements 13 running? Have you updated it to 13.1 yet using an opened project's Help Menu/Updates. If not, please do so.
In what format is the footage now - DVD disc, each containing DVD-VIDEO 4:3 on DVD disc or other?
Please explore the Premiere Elements video trimming opportunities detailed in the following:
(applicable to 11, 12/12.1, and 13/13.1)
Please review and consider and then we can discuss specifics.