- Import from v4 is super broken for credit card accounts and I ended up with weird positive balances that don't add up based on any combination of transactions. Forum advice was "start over".
- You cannot tag income as "available for next month", instead all income must be immediately budgeted. Which is different than the old YNAB advice of being a month ahead. Forum advice is to earmark it a special category then fix it when the next month lands (https://support.youneedabudget.com/t/63pgpp/budget-using-onl...).
- No side-by-side month view. You can only view one month at a time.
The differences were too much for me and the import was so borked that I immediately gave up and stuck with v4.