Since 1 month I cannot block any advertiser in Ad Review Center. I have already contacted the adsense support one month ago, they replied but but unfortunately the problem is still here. I also wrote in AdSense newsgroup - no reply.
My Ad review center is in "auto-allow mode". When I choose "Block all ad groups from this advertiser" then I click on "Save review settings" the page reloads in exactly the same state, without any changes.
Moreover, I can't change the number of items per page and I can't filter ad formats - I always see the same page with 10 items and all formats.
I tried to contact google support again but I cannot find their contact form anymore. Seems like they removed it since.