This is a business account issue that hasn't been resolved in the GA or this Beta.
Previously, when I was in my business notebook (alt-2) and created a note, the note would go to my default Business notebook. Now, there only seems to be one default notebook and it can't be set to a business folder. As someone who uses Evernote extensively for business and personal matters, it's so helpful to be able to quickly decide which side of the online brain a new idea/note is going towards.
I will note that if I Alt-F1 to a notebook in my business account and create a new note, it will go to that notebook, along with the tags I might have also searched for.