Please, accept our apologies for this inconvenience.
There was a minor disruption in our services for a small interval of time. Everything should be up and running from then on. The old trick with clearing your browser’s cache and cookies turned out to be helpful when the error keeps hanging on the screen for hours.
Is the problem persisting? In such case, we would appreciate if you could specify the version of the browser used, optionally a recorded FiddlerCap session (with “Decrypt HTTPS traffic” option enabled) may be useful for us.