I spent 3 hours on the phone. 

This is a hideous joke. Thanks so much QBO - your new invoices are unusable and we are currently unable to bill clients until you sort out your ill-advised "upgrade".  Disconnecting apps that worked in conjunction with QBO and forcing your own process onto it without a way to turn it off or prioritize what we are paying for is a bush-league move. Changing the download screen is annoying.  Adding windows that fly in randomly and block the screen is just stupid.  Oh, and what's the idiocy with resetting the screen to the very top of the invoice EVERY SINGLE TIME you make an entry in the body?

Fix this - maybe introduce your development team to actual humans who use the system every day.