Hi Judith,
Can you see the graphic when previewing one invoice from the batch? Or is it a black box?
Printing invoices to your printer will create a print job in size equal to your 800 invoices. When a specification has an image, that graphic will be multiplied 800 times - so a large image will cause a potentially massive print job that could max out the printer memory.
You may need to print smaller groups of invoices. Or edit/shrink your image in a graphics program (such as MS Paint) to the 'actual size' that it appears on your invoice, and reinsert it into your specification, so that 800 invoices gives a smaller print job.
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Regards,
Softrak Tech Support