New Version: 5.4.1.1 now available
Permalink 1 user found helpfulhttp://www.concrete5.org/download...
It fixes a number of issues with how full page caching interacts with certain add-ons/single pages, a number of serious IE 8 annoyances, improves the file upload experience, and provides some other bug fixes as well
http://www.concrete5.org/documentation/background/version_history/5...
We've rolled this update out to some of our servers already, and it's already on our trials.

The latest version of concrete5 is 5.4.1.1. You are running 5.4.1.1.. Update Now!