I've been trying to figure out why it breaks. Followed some advice and checked out your "Common Theme Mistakes" post. Magazine Basic seems to be a pretty well-put-together theme, and all of the things mentioned are non-existent problems.
Test site is here: http://metagnosis.net
But what happens is that it breaks the format of my page just below the view of my browser, so that when I scroll down you can see that the page is broken and the sidebars are pushed down to the bottom.
This problem seems to exist with all of the editing tools of tis nature, but this one seems to be the best, and I would really love to get it working.