It seems that there is really a problem with AmsterdamCoin deposit from coinexchange to yobit. Based on AmsterdamCoin's twitter post last feb.17, yobit will be re syncing the wallet and allow deposits and withdrawals soon (
@Amsterdam_Coin status). However, if you'd check Ams thread starting with this post
here, there are several deposit problems that are left unsolved until now.
I suggest you to follow that thread to be updated when other members got their deposit problems solved.