I sent several thousand coins on yobit, but it still shows zero on my account
not solved for me. I send my erc20 NBT to bittrex, but bittrex does not show it in my balance
Did you send them to yobit or bittrex? If the latter you will never see your tokens in your bittrex account since the NBT you see there is Nubits and it isn't an ETH token...