Poloniex has, unfortunately, a consistent history of love and hate with STEEM / SBD. For weeks, their wallet was disabled and you couldn't deposit or withdraw STEEM, which created some strange discrepancies between their prices and other exchanges prices (in other words, only those who already had funds in Poloniex could trade and there was no arbitrage available).
Yesterday I sent a small amount there, 20 STEEM and it has yet to appear in my wallet. It's been almost 12 hours already and although I contacted their support team half an hour after the transfer, I have yet to hear from them, which is a bit unusual.
What's strange is that they have no warning about their STEEM wallet having difficulties at the moment.
While I'm confident this will be, eventually, solved, I thought it would be good to let other people know about this issue, maybe prevent other possible incidents.
Later edit: I just got this message from another user, so it seems this is not an isolated incident:
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