Yes, I got the same thing when I tried to log in to Poloniex yesterday and today. Already sent a support ticket yesterday but didn't get any answers yet. They are probably backlogged in answering all the inquiries to what is happening. I have read horror stories about people getting locked out and no support. I get a yucky feeling. But, if I lose my coins it's definitely my fault for leaving it on their exchange and I'm gonna hate myself for awhile. Tsk, lesson learned the hard way!