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What you did should work. Clicking on the down arrow should remove the vote, and clicking on the up arrow should switch it to an upvote. I just tried these on a question, and they worked fine. Have you tried reloading the page and things like that?
If you wait too long, you can't change your vote unless the post is edited.
Ah. That makes sense.
If memory serves, this is one of the big-list CW questions? In that case, jhschenker should be able to edit the post and thereby unlock it to changing votes.
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