Problem has recurred, after a couple days without problems upon installing the latest version. Restarting the app did not solve the problem. A note app like Evernote is critical to my work. The reliability issue we are discussing, along with excessive nags to upgrade to more expensive version, has me actively evaluating alternatives. I have happily paid for Evernote for many years, but the value proposition is rapidly waning.
I have this problem. This is NOT the first use after downloading the new version. The notes content in miniature are visible in the card view The notes content are present on the web. Re-starting the program does not resolve the problem. In Help menu, choosing "about Evernote" yields a popup with no content.