Here's another weird thing...
I individually rebuild some item thumbnails, and these thumbnails were displaying fine.
But then, when I ran a "Check for and create missing thumbnails," that process deleted some of the thumbs that had a "failed!" error that I listed above.
So, that "create missing thumbnail" process must have deleted the thumbs that I manually created in the product "edit" window.
Do you have ideas as to how I can resolve this, Chuck?
I appreciate your thoughts.