You know the latest official leveldb release was 20 days ago ? Do you think 100% of the coins are using it right now ?
Also, why Yobit doesn't have to update ? If they use the old leveldb from sigt, there will be a problem, no ?
Why cryptopia delisted more than 20 coins recently and put the listing fee to almost 10 btc ? because of wallet problem ?
I think it is more because, as they are a small exchange, they can't deal with so many listed coins. They were too greedy and now they can't manage in a correct way. So every time there is a problem, they prefer to delist the coin instead on working on a solution  because they are in a fucking rush, but they will never admitt they have a problem (see what they said for Visio : pure shit).
I never used this exchange before sigt because I knew it was shit, I will not use it anymore.