By the way, it seems Wordfence uses cookies in relation to cache.
Unfortunately, in some conditions this means viewer view old pages. In a typical blog this is as if the blog didn't change for days and they don't see the new posts.
Ideally, there would be some kind of panic button in Wordfence Plugin "Ignore Cookies older than x days".
This would solve the problem of asking the viewers to delete cookies on their computers, because most are unable and/or unwilling to do so.