it's probably related to the hard fork, because bitshares wasn't showing SBD/STEEM either today until just earlier this evening. now it's back on their list again for deposits/withdrawals. Still probably also worth comparing the exchange rate at blocktrades for the future as well. Just used it to pick up a few BTS and it pretty much gave me the coinmarketcap rate.

say what you will of poloniex, but hopefully it should turn out okay this time around for you guys @ausbitbank & @vangelov.