On what computer operating system is your Premiere Elements 13 running? Have you updated 13 to 13.1 using an opened project's Help Menu/Updates? If not, please do that.
What version of Premiere Elements did you use before where you did not have problems with the previews in the Edit area?
If you were using version 10 and earlier, you may not be used to 13 project automatically setting the project preset. Sometimes it does it right. Sometimes, not.
So, before we consider uninstall reinstall, there are certain things to check out
1. Does the problem exist with and without the antivirus and firewalls disabled?
2. What is the project preset after you import your source files......see Edit Menu/Project Settings/General and its readings for Editing Mode, Timebase, Frame Size, Pixel Aspect Ratio (even if the fields look grayed out). Does the project preset match the properties of the source file?
3. What are the properties of the source files....video (format and duration) and photos (pixel dimensions and how many).
Let us start here and then decide what next based on the details of your reply.
hereby our printscreens about the setttings of the project and the properties of the source file
The previous version that we used of première was 9. Before we installed première 13 our pc had a format C by a professional store.
The problem exist also with antivirus and firewalls disabled.
For video the format is 1080i 25 frames/sec pixel 1920 x 1080