I have the same issue and support send me the following instructions:
1. Press CTRL+SHIFT+ESC keys to open the task manager2. Select More Details to view the background processes3. Select any processes with "Evernote" in the title, and end them (End Task)4. Open File Explorer (fka Windows Explorer)5. Paste %appdata% into the address bar and press Enter6. Rename the Evernote folder to Evernote.old7. Launch Evernote again and sign in
I followed the instructions and it worked. But after a while I ran into the error of the repetitive task that when I marked it completed it returned to appear incomplete. I deleted that task and my tasks no longer appeared.
And now the previous instructions no longer work either.
I am waiting for an answer from support.