What the subject says. With my profile set to "see anime list" / "see ep info" enabled and everything disabled, the "seen" icon appears besides viewed episodes nevertheless. From the descriptions, I figured that the seen icon shows up only if either state info or file info were enabled.
Update: Ah ha, it is a bug after all! With "see viewed info" off, the seen icon besides individual files disappears, but it's still there for the Eps...
Update 2... *sigh*
With "see viewed info" off, animes are still colored and bolded when all Eps are viewed, giving hints as to which files have been viewed and which have not.