I'm still having troubles as well but I finally found a workaround with Chrome. When I log into Evernote and get a blank page (99% of the times), I open another instance of Evernote in another tab. This somehow unlock the other tab and Evernote gets loaded as it should. Everytime something is not working properly, I repeat this procedure. It's like this trick is re-activating the stream of data that somehow gets blocked.
Let me know if this works for you as well.