It happens to me on Google Chrome but not Fire Fox. I think it was yesterday.
It could be related to the New Rules: No Hentai Images where Google blacklisted Anime Vice due to the growing obscene image collection, both real porn and hentai. The mods and the community did get rid of lot of them. Occasionally, I do find new porn bots, but I report them immediately. I always watch the activity feed especially the image feed.