I say “many others” after performing 2 hours of research on the internet. By corrupted files, I mean the error message “Project appears to be damaged and cannot be opened.” There are others with this same problem on quite a few forums. I did have AutoSave on, and also saved my project before and after each rendering. However, the autosaves are in no way current and furthermore are unable to find the location of the pictures and audio I have placed in the timeline. As for not being current, maybe since I manually saved every 3 minutes, Premiere Pro doesn’t AutoSave unless there’s been at least 5 minutes without a save?
The most promising result to fix my problem (from what I have read so far) is to use xmlwrench or a like program to clean up the file. [Suggestion on stevengotz.com/premierepro.htm], [also a very extensive post at https://ppro.wikia.com/wiki/FAQ then go to Question number 106].
Thanks for your reply; please let me know if you have any thoughts.