Thank you so much! =)
Have to love the phenomenon of computers and how they choose to save =)

I'll try to remember to save "versions" for each save going forward, or increase the number of auto saves and verify the saves going forward!

I truly appreciate your looking at it (whenever you can), and all you can do! Thanks in advance!!

1.) What did I do? --Saved the game as per normal, was playing on 22 May, 2021 without issue all day, utilizing auto-saves as normal. Completed for the day and manually saved, exit the game, and quit the game without issue. Started Factorio and went to load the game to play again on 23 May and none ...