Is this an invoice system you created from scratch or one that you modified such as the FileMaker Invoices Starter Solution? Such info can be very helpful when suggesting a solution.
Assuming it's the Starter Solution or one similar that prints from a layout based on a line items table...
From problems past users have encountered, I'd first take a look at the total height of the header plus the footer and compare that to the total height of the print area for your printer. It's possible that they are so tall that you only have room left for one line item at a time.
Also, check to see if you have View as List and not View as Form specified for this layout.
It's the starter solution I've used.
The .png I've used is atually a full page size. So that is probably the problem.
I'll try to find the heights first.
Thanks for your reply!