I added https://evernote.com/ per the suggestion of Mettarefuge. That did not work. I would rather not, for security reason, allow a blanket rule to allow third party cookies. Evernote has 5 cookies set on my PC already. I would prefer not to allow a blanket rules for allowing third party cookies as that presents obvious security issues. I hope Evernote can come up with a less drastic solution.
I had a problem for quite a while on my PC where the notes pane content would disappear. I found that if I closed out of Evernote via EXIT under FILE in the menu and then restarted the program that all of the content came back (Paid account).