I do like the new essential theme although I'm not using all the features just yet, still experimenting. Nice design as usual and very flexible.
The blocks in the category area, the nav and admin blocks, drop below the list of courses when the browser window is expanded horizontally (Chrome and Firefox). You would expect this as it is contracted but not as it is expanded?
You can see an example here http://moodlenz.net/course/index.php?categoryid=2 (no need to log on).
Moodle 2.6 and Essential latest (Jan 2014).