What possessed you to remove the tab functionality? That's so basic and useful a feature that surely you must have just forgotten? I rarely make posts like this but it's just so disappointing and frustrating that something I liked so much has blundered the "new great version" so much – I need to go back to the old one or, like others have mentioned, move to something else. I've used Evernote for around 7 years or so and have recommended it to a lot of friends – not anymore.
If you're going to put so much effort into an update, how could you not ask your users more carefully what they do with your software every day???? I work in UX. And one thing we definitely try to avoid is to piss off a bunch of customers and make them look for something else...