@ROBERT, i added a section "related to widget" with links to the related widgets. As this is what the whole site is affecting and many internal links ( all are "nofollow" ) are created, maybe a treshold has been reached.
My guess is, that they added some new categories in different niches. As my niche shows more brands than before this update. That would explain why only some site see drops. Its not that the brands would help poeple.
For example, if you buy a car, you will not go to the manufacturer but to the reseller?
My niche shows for 90% of all queries:
1 big reseller, every time the same
2 ebay like ebay.xx/phb/widget
4-10 may vary:
4price compare engine
6 mom pop site
8 ecom shop