When viewing a customer (Contacts -> Search, customer, Credit Accounts -- or follow link from a report), there are buttons to generate a Customer Invoice, Sales Order, Quote, etc.
In previous versions, this takes you to a new invoice/order/quote screen with the customer name/account loaded.
In 1.4, you are taken to a new invoice/order/quote screen, but no customer is selected, and you need to re-enter the customer name/refresh before proceeding.
Also, if you add a line item to a screen before updating, (e.g. the customer has not been loaded into the form) you lose the changes to the line item.
Moving to github as enhancement.
https://github.com/ledgersmb/LedgerSMB/issues/932