Hi,
I have changed the JS source option on the Compatibility settings submenu to “minified” and it solved the problem.
However, the issue was caused by numerous javascript errors in your site footer and header:
Issue 1: http://i.imgur.com/zl7oqw8.png
Issue 2: http://i.imgur.com/fHHNOmM.png
You should definitely check these problems and solve them if possible, they may cause problems with other plugins, that you might not even notice.