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Most probably it's the aftermath of HF19. But malice from Poloniex can not be ruled out.

Please explain what you mean by aftermath of HF19.

Thanks!

By that, I mean that Hard Fork 19 has made changes to Steem Blockchain and when a blockchain is changed (via programming), Poloniex disables their cryptocurrency till the time new changes are tested. That's the answer.

Thanks for concisely explaining to me what I needed to know.

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