We have ran into a snag on one of our projects.
When you use the theme customizer in IE7,8,9,10 it works just fine, however the moment you enable Easy Blogging and click on customize theme the entire left nav of the customizer is gone, and everything is broken looking.
First thing I thought was, well obviously our theme is getting in the way, so I undid our theme and used just default twenty-twelve. Same issue. Everything else in easy blogging looks great, it's just the theme customizer that gets broken. And it only happens in IE, every other browser looks fine.