After installing the new version of Evernote for Windows, the encrypted text can still be revealed as before (although its unformatted and uneditble, as described in about a dozen other threads.)
But when I open the same note in Evernote for Android, and try to reveal the same text, I get the error "The passphrase you entered is incorrect." I doublechecked by doing it several times on Windows and Android, but it just does not accept the passphrase.
I just discovered something else: if the text is currently revealed in Windows, then I can reveal it in Android.