Infinite Authenticating

As in title I am stuck in login screen on authenticating process, never had this problem before. Yesterday I could normally log in, nothing has changed in area of my system (Windows) or connection on my computer (as far as I know). I restarted modem and router, used repair files option. What else can I do with it?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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