@PinkElephant - Yes, I have been a premium subscriber since EN was new (I forget what year that was, but centuries in Computer Time). I have submitted a tech support request, but not heard back yet. (I just submitted today, Saturday, so that is not surprising).
Since this is on the EN site, I had assumed it was official. Didn't realize it was only user-to-user. That limits it usefulness quite a lot. (Though I appreciate others trying to help, most of the time I can solve my own problems -- when I can't, it tends to stump others too)
I used AppCleaner many years ago, and it caused more problems than it solved, so I have avoided it and its ilk ever since. Are you saying it is better now, and won't lead me to a week of fixing the mess it creates?
I also assume there is some corrupted file. I did a system search and removal of all files with "evernote" or "quicknote" in the name. I also moved all "enex" files out of reach (hoping I could use them again if EN starts working). I have installed from the AppStore and also from the EN web site. No improvement or change in any of that.