I'm a little concerned about steem wallets being disabled on the exchanges. Poloniex's wallet has been disabled for what seems like forever. But now HitBTC's steem wallet has been disabled for about 5 days.
It looks like there is a problem with the wallet itself, and I hope they resolve it because otherwise we'll all have coins which we can't send to any exchange.
It makes me nervous as well but Blocktrades is a good backup.