schema.org error - Missing:name

Dear Sirs:

Thanks again for an excellent plugin and for the excellent service in the past!!

In Google Webmaster Tools under Structured Data Markup we have a few thousand errors on MarketPress pages such as /store/products/category/* and also on pages using mp_list_products. The error is: "Missing:name". In examining the source of such pages I can see a class "hmedia" and class "fn". The content of the span class "fn" seems to be a name, but it does not match the product title exactly, and in any case we get the "Missing:name" error. How do we control the hmedia content and rectify these errors?

Thanks in advance for any clues to this mystery.