Writing

Maybe it is because it is owned by System, but then, there are other answers owned by System that already have upvotes.

Note that I don't have any problems to upvote other answers on the same question.

(Unrelated observation: The link seems to position the page at the end of the question instead of the beginning.)

is a duplicate

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not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

Communities

Comments on Why can't I upvote this answer?

Why can't I upvote this answer?

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