There has been a lot of coment on withdrawals from Poloniex and Bittrex. You can easy withdraw from you steemit account in les than 2 min.
Login to you account
Go to wallet
Go to Steem og SBO and click "sell"
The BlockTrades hp will popup
Select steem or SBO for fx. bitcoin/ether
Enter your receive address
A menu will show where you can transfer your steem or SBO to "Account and memo"
Go back to you wallet and transfer the ammount you want to withdraw
Check memo and adress are right
Wait 1-2 minuts
I hope that it will help some.