new client login issue

i can log on everywhere besides the client everytime i tried i get this message ive also created a new account changed my password 5 times reinstalled the client repaired the client still gives this error message.

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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