Yup, looks like Bittrex have locked many accounts with no prior warning, holding users' funds hostage unless they go through even more KYC procedures. Even with some users like yourself who have already done KYC, apparently the KYC is not good enough anymore, and they require you to take selfies whilst holding your ID and piece of paper saying "Bittrex" and the date. Completely laughable, and completely scammy to suddenly lock down users' accounts like this. "Send us your details or forfeit your coins" is essentially the message.

Yet another reason to never leave your coins on exchanges. Disgusting behavior from Bittrex.