In Pay Bills for example if you notice a bill has been entered for the wrong value you can click on the bill and change it but it doesn't live update the value in the Pay Bills window. In order to see the revised amount you need to exit the window entirely and then get back into again.
Exactly the same problem exists in Receive Payments. v19 didn't have this problem, if you changed an invoice or bill it changed the values displayed in those windows instantly. This is incredibly frustrating if you are in the middle of applying a payment and notice an error.
'Instantly update changes made to bill and sales figures in pay bills and receive payments windows'