I wanted to check out an old game in my library and I just noticed that all of my game ratings are gone! I had rated ca 30 or 40 games but none of them have a star rating now. I also can't rate any new games. Whenever I rate a game (without writing a review) it seems to register. At least the rating is still there when I refresh the page, but when I log off and on again it's gone.
Is this a new feature that I'm not aware of or is it a bug?

Probably a bug, there are tons of bugs happening at the moment.

I'm afraid that the whole site will crumble into tiny ones and zeroes because of ravening bugs when the changes that GOG most probably are doing go live...