I was concerned for a moment just now because it looked like one particular setting wasn't sticking: "Hide me from site-wide searches on flickr.com and on 3rd party sites that use the API?"

I checked the box and hit "save", but when I went back and looked, it wasn't checked. I tried again and it worked.

I wonder if they're using one or more caching layers and not being careful about fetching important bits from the authoritative layer.