Is it at all possible to print or preview an invoice without it actually been sent to the client?
At the moment the only way to print an invoice is to screenshot it otherwise it applies and mails...
Since when did the word "print" mean "sent"??? Print means print. There is a button to email the invoice to the contact which works correctly, but resetting that button to "resend to customer" when the invoice is printed is totally erroneous since it makes the HUGE assumption that printing an invoice results in that piece of paper going into the mail or handed to the customer.
If you want to mass indicate that invoices have been sent use check boxes and a master button to "send all" or "mark all as sent".