I upgraded today as well on W7Ultimate 64-bit (Evernote_18.104.22.16865). I was unable to save any text in any note that was created prior to the upgrade. If I navigated away from the note after typing it, then returned, the line disappeared. When I created a new note on this version, it seemed to save the note/text, although I did not try to sync. I just did a system restore and everything was back to normal with 22.214.171.12456. Tried reinstalling 126.96.36.19965 again - same behavior. Restored again; I'm sticking with 188.8.131.5256.