On what computer operating system is your Premiere Elements 13 running? Have you had the opportunity to update 13 to 13.1 using an opened projects Help Menu/Update?
What are the full properties of your source media and how are you importing them that you are trying to import into the project? A quick way to get that information, if you do not know that information, is for you to post the brand/model/settings for the camera that recorded the video.
Do you have the latest version of QuickTime installed on your computer with Premiere Element 13, and are you running the program as Administrator?
Lots of additional questions, but the answers to the above may give us the answer that you need to resolve you issue.