It is possible you are doing something wrong because I don't have the same issue on my machine. The trick will be working out what might be going wrong.

Your header shows you are using Windows 8 and Office 2013. Is that correct? I tested on the current versions of both so that might be one source of the difference in success.

I also notice there is a difference in capitalisation on the hover tooltip and the error message. I'm not convinced this would cause it to fail but perhaps your default browser is case sensitive (I would have thought this would be at the webserver end but perhaps it is your browser).

Can you post your sample doc so I can see if I have the same issue on this machine?

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Andrew Lockton
Chrysalis Design, Melbourne Australia