As so many times before people are reporting having problems with sending or withdrawing Steem/SBD to/from Poloniex. It's estimated that a total of 25,000 transactions are unprocessed.
Poloniex did not warn their users or stated what is causing this and when it will be fixed so beware when trading and try to avoid Poloniex at all costs.
SBD is going crazy in the past couple of weeks trading at around 10$ so everyone is selling it and taking great profits. I wouldn't want to see anyone get burned and loose their hard earned gains on some garbage exchange that is scamming it's users so please beware!
I suggest that you use Bittrex as it never had any simmilar problems before, has great transaction speeds and takes minimum fees. It's better than blocktrades and our internal market so be caucious with your gains on Steemit and cash out wisely.