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I'm aware of this issue and will keep an eye on it, but I wasn't able to reproduce it yet. I'm guessing it has to do with some misconfigurations in your browser?
Maybe both of you could check weather cookies are enabled in your browser, as we use them to identify every user session.

With one account I can login, with another I can't.
You can try with the test account @social.
(You can find the private private posting key in the account's "about" field)
I just tried and I can't login.

Cookies are enabled, same negative result using different computers and different browsers.... Thanks for looking into it.