Webmaster Tools - Structured Data 100% drop. Many people with same issue, nobody seems to understand what might have caused it.

[PhilippGreitsch]

WMT shows a significant drop in structured data markup on June 7th, steep incline by June 21st.

Now the same thing happened on August 9th, with no signs of recovery. Lost 45% of our search traffic.

There are many people with the same problem, and nobody seems to know what caused it.

Here are a few links to some forums: #1 Google Groups, #2 Google Groups, #3 Google Groups, #4 70% drop on GWT on June 7 Google SEO News and Discussion forum at WebmasterWorld.

On our end we see a 100% drop in breadcrumbs and a 100% drop in hcards leading to a 45% search traffic drop.

Any ideas why might have happened and how to fix this?

[bjs2010]

Ive had this happen to our site too - using hproduct tags - and they have just dropped completely - no change in our code...

Would like to know why...

[BrandBuilder]

Google seems to be rolling out changes to Google Webmaster Tools. I SWEAR I saw our results drop to nearly 0 on the 23rd and back to normal today. I just checked the GWT right now and the results look like normal (no drop) AND it seems that Google has updated the reporting on BlogPosting and SiteNavigationElement. Both of them seem to show a 'name' field.

I am so confused how the SiteNavigaitonElement is supposed to be marked up at this point. If you use an unordered list for your nav should you markup the

• , and should you have a span that includes the name property?