I installed Super Cache for a short time and then removed it. However, I see a very strange phenomenon:
When my hoster does backups sometimes your plugin creates some kind of folder called "supercache" - strange since it is no longer part of my site. The front page then shows no updates and reverts to material uploaded more than amonth ago. To test our theory we simply renamed the directory
wp-content/cache/supercache to wp-content/cache/supercache.old and
reloaded the page.
Now the first article being shown is the one we uploaded a couple of days ago.
Needless to say, I don't know what this supercache plugin is doing,
but it renaming the directory from the "supercache.old" back to
"supercache" you one again see the article from December so it would seem that the time travel problems are related to this plugin.