As soon as I heard rumours regarding the bittrex ban, I tried to login and check my account as well. It seems to be working for now. I believe bittrex released a note stating that the ban only applies to unverified account. It sort of makes sense since we as a cryptocurrency market seem to reaching a point wherein regulations are being worked upon and people are getting engaged with cryptocurrency more and more.
More details can be found at:
https://www.cointelegraph.com/news/bittrex-exchange-breaks-silence-on-banned-accounts-questions-remain