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If you can downvote any comment, then you've got downvote powers.

You cannot downvote direct replies to your own comments though if that helps understanding what might be happening here.

There's a time window for downvoting, once it has expired nobody can do it. I don't remember what the period is, maybe 12 hours.

The thresholds were a guess tbh. Glad you got your downvote powers :)

You can't downvote replies to your comments and in other circumstances I think.

Downvoting is not supported for posts--only for comments. Once you have the power to flag, that is the option.