I see plenty of Bittrex investors buying on Poloniex at sub-ITO price, then selling an equivalent amount of their captive BLOCK into the Bittrex buywall. Cross-exchange arbitrage.
I believe deposits and withdrawals are closed during this 48 hour so you can't arbitrage.
Yes I CAN.
Withdraw is closed for Bloks, not bitcoins
I can sell all my block's on bittrex, then imediatelly I CAN withdraw all received BTC's right into poloniex, and easy re-buy about +10% more bloks on poloniex. Why do you think I can't

?