Same problem. Upgraded to iOS 10.1 and all notes on iPhone stuck in view only mode
I use my phone a lot to add to an existing note when mobile.
This is a serious flaw in upgrade
please fix ASAP
I am trying to stay loyal to Evernote but every upgrade seems to cause a problem
Adding a tag To the view only note (Created a new tag called Fix ) allows note to be edited - so a work around For now ( thx to stocky2605 for sharing)