we have noticed that in the latest vBulletin 4 release, there was a small change in the cookie prefix structure. Basically, after the prefix specified by the user, also an underscore character is added by vBulletin. This is an inconsistency with previous vB versions that may cause some problem to people using integrated software, which is based on the old cookie prefix structure.
Not to mention, if an admin wants to add an underscore, he can already do it by adding it in the cookie prefix field in the configuration file; this is a small change that has no benefits, in my opinion, and less transparency.
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