Hi!
On internet explorer console I found lots of error messages, not originating form the plugins, there is 1 in particular that might be causing the problem and stopping further script execution because of a fatal error.
Error message: http://i.imgur.com/1e57DQA.png
Cause: http://i.imgur.com/oExXyWQ.png
That script file is filled with outdated code, that is no longer used. I recommend updating or removing it, it will cause lots of problems with javascript rendered plugins.
There is also something preventing some of the CSS files from rendering. I investigated for over an hour, but I could not find out what. The search CSS files alongside with others are not rendered at all, even they are in the site header correctly.