I have WP File Monitor installed and it is constantly notifying me that some images in my /uploads directory have mysteriously changed. Note, however, that the images themselves have not changed - only their "Last Modified Date".
Further diagnosis revealed that those images were being displayed on my homepage as part of a section that displays my latest 3 blog posts. Thus every time that homepage is viewed it causes the "Last Modified Date" of the featured images associated with those 3 blog posts to get updated to the current date/time.
How do I track down the culprit?