TyMax - 1:34 pm on Jul 12, 2013 (gmt 0)
In some ways it has not bothered my main sites, but in other ways in highly valued key word phrase I have gone from first or second to last on first page on first on second page. I think Google sees duplication on two pages. But one page defines types of the product, the other lists the most common type of the product.
No matter what minor tweaks I try Google still has demoted a page that was a benchmark for defining the types of this product for well over 12 years. Other websites copy and slightly alter the definitions. This Google upgrade is the first time it has caused problems. Mean while it does extremely well ranking wise else where.
I had a lot more hair before I started SEO work. This change is not helping.