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?
