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Please take a look at these results from Google's Rich Snippets Testing Tool.
Way down at the bottom, there are a couple of errors . . . which look like they are coming from the plugin itself rather than the submitted data. Could you check it out please?
Warning: Missing required field "updated".
Warning: Missing required hCard "author".
There are also a couple of "marked-up content does not appear to be the main focus of the page" errors coming from somewhere. If anyone knows how to resolve these, I'd appreciate it. This page (not our client) passes the Tool check perfectly: