HGannon

I wanted to thank Cheedoh. Your solution solved my problem - and easily!

I'm having this problem too but am stuck at a different point because I followed another post to remove everything and reinstall Evernote from Mac App Store.  I have Evernote 5.2.1 for Mac installed and I'm running OS X 10.8.4.  On initial sign in screen I get this message whether I use my email address or username.  Since it's a reinstall, I can't move on and can't see the <null> account option mentioned earlier in this thread.  I can login to website without an issue.  

I'm having the same problem as varic, but I don't have dual factor authentication set up.  I set it up to see if it would fix the problem, but it still appears as though Evernote won't connect to the internet.  The strange part is that it's working from my desktop (an '11 iMac) but it's not working from my laptop (a late 2010 MacBook Air).  Also, I can use evernote online.  It's very frustrating that the laptop version won't let me do anything!  It used to work, but has not since the update.

Update:  The application will allow me to connect to the internet to reset my password, it just won't let me log in.