Usually this is caused by a JavaScript error, often caused by the theme.
Can you check with the default WordPress theme (2012/2013) and see if the problem persists. You can do this without disrupting the end user using a plugin like Theme Test Drive
The only JavaScript error I can see currently is related to your theme.
Try actually switching the theme (not through test drive) to either twentytwelve or twentythirteen for a short while and test again.
If you leave the default theme active and post here to let us know we will also check to see if we can see any other issues.
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