I am running Big Sur 11.3.1 and when I launch Evernote I get a box "Something went wrong on our end, sorry about that. Please try restarting Evernote." I contacted Apple Support. They had me reinstall Big Sur. I trashed Evernote and reinstalled. It sometime almost loads, sometimes does not load at all, but never is usable. No problem on my MacBook that is Big Sur 11.3. This is a big bummer. Really interferes with my workflow.