It's not popping up when you try to access the screenshots, but when you try to access the Still Life page itself. So I don't think the box and the screenshots necessarily have anything to do with each other.
That said, there's nothing on the page that's really mature content, and they don't treat other M rated games (like Missing) this way. Weird.
Who knows, though? Maybe there's some legal issue that we don't know about.
-emily
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