In other words, there was a forum where some pages were locked and required a password to either edit them or post comments; before that password was entered, you wouldn't see the comments area. That was the way it appeared in 5.x, but in 6.0 that changed.
The reality is that it did and it didn't. In previous versions, both regular users and administrators were being asked to enter the lock password before posting. This was contrary to the idea that administrators have access to everything; they could certainly go into the edit page and start editing without needing to enter the lock password for example. So in that respect, there was a bug.
In version 6, with the bug fixed, administrators are allowed to post without a password. However, your regular users will not see the comment form, and will still have to enter the lock password to post. In other words, to them it will behave exactly as before. Logout as administrator and try it out.
One other small change in this area: when a page is locked, the edit page will have a message saying "This page is locked." Before, it wasn't easy to tell if the page still permitted comments to be posted without entering the password. Now if it does, you'll see "(Comments still allowed)" added to the message.

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