I've tried to uninstall the app, then deleted all files under ~/.cache/com.ubuntu.reminders, ~/.config/com.ubuntu.reminders and ~/.local/share/com.ubuntu.reminders directories. Then installed app again, configured Evernote account, synced and... the app crashed. Only the titles of 4 notes (out of many) got downloaded, with no text inside. Maybe it's something faulty inside the notes. Have to investigate logs. Will report if found something.