I am having some notes that update and others that are blank (no preview permitted). They all seemed to appear when I was on evernote web. But I was surprised to see today that I had to choose only two between web and desktop and mobile. I haven't done anythign different except to update to see if the blank note would disappear, so I was surprised to see that. Anyway, for the moment, I didn't upgrade because I felt a little like i was being asked to do with a gun to my head.
You can't even select those blank notes on the desktop to edit them. my activity log is attached.