If you use product reviews I may have stumbled on a minor 'bug':
It is entirely possible I'm incorrect, but I think part of the file includes\classes\observers\nmx_structured_data\class.breadcrumbs.php
doesn't validate (
http://www.w3.org) because this code: on line 48:
'<meta itemprop="author" content='.$reviews->fields['customers_name'].'">'.
should be:
'<meta itemprop="author" content="'.$reviews->fields['customers_name'].'">'.
The change is an addition of a " at the end of content=
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