> Hi, and welcome to the forums. Lots of people use Evernote each day without data loss
I bet there are, but I'm not one of them.
> Which version of Evernote are you using?
I'm using the web client.
> Click on the black button and switch to the "Classic" editor and see if that shows the vanished note.
That didn't help. To be clear, I'm missing a large set of changes to an existing note.