Please see the tweet below from Binance Customer Support. Binance is currently unable to transfer ZEC out of their cold wallet due to the ongoing issue with Ledger. Over the past week, Pacu, Zooko, and I have been in close contact with Binance and Ledger to try to help resolve this issue. Pacu tested a fix last week that should allow Binance to transfer ZEC off their device, but Ledger needs to conduct additional testing and audits before releasing the update. Ledger believes that the earliest they can release the update is Thursday, April 17.
The issue with withdrawals is causing price discrepencies between exchanges. Exchanges rely on arbitrage to keep prices aligned. Since traders cannot withdraw ZEC from Binance, it disrupts the arbitrage process, which has resulted in significant price differences between exchanges.