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Yep, I've found it.


As you know, XenForo makes use of HTML 5 Microdata in its markup in order to identify the breadcrumb and other page elements to search engines etc.


Google's use of HTML 5 Microdata is changing rapidly as it recognises more of the syntax, and as a result it can interpret pages differently. It would appear that a change (at Google) late last week resulted in Google being unable to parse the microdata on XenForo pages, because we repeat some of the breadcrumb microdata in the bottom breadcrumb, after its primary inclusion in the top breadcrumb.


Removing all the microdata from the bottom breadcrumb has resolved the issue, and as you can see, you can now +1 pages on XenForo.com to your heart's content without errors.


Stay tuned for more updates.


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