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Solucionado
Can't down vote without error, yet I can up vote.
It seems without fail after I post a comment, I get an error if I try to down vote someone in the same comments. Yet, I can up vote others and the score is immediately applied.
Why?
Servicio de atención al cliente por UserEcho
That's by design. You can't downvote for a full minute after you comment on a picture.