I'm having a problem video editing with Adobe Premier Elements 14. After I close out an editing session, when I reopen it to continue editing, all picture frames have turned to red squares. How do I restore the working sessions?

I'm having a problem editing videos using Adobe Premier Elements 14.  After I close out an editing session, sometimes when I reopen the program, instead of viewing video frames, each frame has turned into a red square.  Right now, I'm very unsatisfied with the product and will not recommend it to anyone, unless I get some help to restore my work.

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