dawdillon's post in Windows 10. I click on "Check for Updates" and pop up screen is blank. was marked as the answer
The workaround for this is quit Evernote using the menu (File-Quit). Then kill off any remaining Evernote processes. When you restart Evernote, you should see your note content as well as content in the About, and Check updates and other popups. Annoying, but it's consistent.