I just upgraded a WordPress MU site from 3.1 to 3.4.1 and now this strange thing has happened.
- The user makes changes and updates a post.
- The front page of the blog (and category, tag listings and so on) displays the old version of the post – the way it was before it was changed.
- When you go to the permalink of the post the correct updated version is displayed.
This behaviour is the same for anonymous as well as logged in users.