This is the Yobit Support answer:
Wallet is on maintenance.
The solution to this cryptocurrency will take some time, need to update the wallet.
We apologize for any inconvenience
**Please check wallet status before deposit or withdrawal
Update the wallet! that's the reason???
Yobit Staff simply needs to update it, it's not so difficult, it requires only few hours if somebody takes care of that.
I really hope that they will do something soon, I have more than 2 millions coin available for trading.
I got 623 confirmations that my 1000 ANT deposit reached my Yobit ANT wallet...
They simply need to check it and credit me my deposit.