It's possible that you're having a browser-related issue. That could be the reason why can't print your paid invoices. Let's troubleshoot it by clearing the browser's cache. Then, let's print it again from the customer's profile.
Is there a way to print the paid invoice at the end of the process of receiving the payment? I am trying to improve workflow. Save and Print doesn't seem to be one of the available options, and selecting print from the bottom of the screen prints the invoice out without the "paid" indication on it. If I "Save and Close" I have to hunt for the paid invoice in a separate step to print it, which doesn't seem efficient.
I am receiving the payment by selecting Sales>Invoices. I see the unpaid invoice on the next screen and click on "receive payment" to begin.