PS: also look for any add-ins (Options Add-ins) of doubtful provenance, e.g. not from MS. IIRC in a vanilla install of 2010 all the 'built in' MS add-ins are Inactive, might be different with 2013.
You might want to activate the two MS add-ins that find text marked as hidden and invisible, they are normally inactive, and maybe the one that looks for custom XML.
BR
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