I'm experiencing the same: a white screen on attempts to log in using different browsers (used two computers) during several last days. I have one browser which was already logged into web Evernote - it is working, as well as a Windows Evernote client and an Android one. Today I've got another error on attempts to login in with Firefox (not the white screen) - "Sorry, we're having some trouble loading Evernote Web.Try reloading the page."