I'm baffled.
Evernote > About Evernote brings up a blank dialog box.
Help > Check for updates brings up a blank dialog box.
I'm seeing a lot of frustrations with v10, and encountering some of my own (e.g.: search, click on a note in the results, the panel on the right is blank; double-click on the note, an empty window opens up.)
I'm guessing I now have v10 but I don't want to ***** things up trying to go back to the Legacy version...