a boards bug?

sometimes when i want to upvote or downvote a post/comment, it sometimes says 'So sad, you are not authorised' and it won't let me upvote/downvote, but why would i not be authorised to upvote/downvote a post? is this just a bug or something i just dont understand?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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