Re: No sound in previously created ".prel" files when I reopen them

What version of Premiere Elements and on what computer operating system?   -12

What sound is not heard - that from numbered Audio Tracks, Narration Track, Soundtrack?     - I don't hear anything

How many prior saved closed project files (prel) have you opened and could not heard sound the existed in those files when they were saved closed?     - a few

Same particular audio file involved in each case?

Can you open a new project and maintain the sound before and after save close reopen?     - yes

Did you create narration using the project's Narration Tool and add it to a Timeline already consisting of Soundtrack and other non narration audio?    - yes, but I deleted it and still the same result( no sound)

Let us start here and then decide what next.