In the latest news from Adsense there referral program has been upgraded to 2.0 but I have still not made 1 dollar from sales and I do not know anyone how did either.
I will try to see if can put in some ads in Adword to see if I can get it to work and get some sales from that end.

The site diagnostic is not new but some people does not notice it is located here

https://www.google.com/adsense/report/report-crawling

You should check it once in a while to see what sites Adsense thinks you have a problem with. Most of the time it is document you deleted or something but sometimes it can be a big problem with your site and you might loose income.

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