I'm not sure the number is constant. I think it scales with either the age or the prominence of the comment. I've seen threads where I was unable to downvote top tier comments, even though I could downvote their children.
I did see interesting behavior when I crossed the threshold: I couldn't downvote comments that existed before I reached that karma level (or at least the UI didn't render them with a down vote button).
I'm not sure the number is constant. I think it scales with either the age or the prominence of the comment. I've seen threads where I was unable to downvote top tier comments, even though I could downvote their children.
It's constant at 501.
I did see interesting behavior when I crossed the threshold: I couldn't downvote comments that existed before I reached that karma level (or at least the UI didn't render them with a down vote button).
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I think after 8 hours you can't downvote a comment anymore.
Are you sure you do not suffer from a mitm?
I'm at -17 guess not going to downvote ever :D