I was experiencing exactly the same issue as everyone else with the authentication problem. I resolved this by adding an 'Exception' rule for Cookies within Firefox. Open up the FireFox Options screen, click on 'Privacy' in the left hand menu, click on the 'Exceptions' button that is on this page, add the address of the website - https://evernote.com - give it an 'allow' status, click 'Save Changes'. Once I had done this, closed and restarted the Firefox browser. Clicked on the Evernote icon in the top toolbar, entered my Evernote credentials, and it worked straight away. The red dot is no longer there and clipping works brilliantly!