vBulletin 3.8.11 (as well as 4.2.5) did away with the cookie based "Thread/Forum Read Marking Type" in favor of the more precise database marking type. Once a thread is read, it is no longer new, and therefore does not show up in the "New Posts" search, which most people find preferable; I know I do.
Also, with the database marking type, a user's unread threads will be preserved even if they log on using another device.
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