Hi Pete,
Yes, I can print normally from every AOO4 app with the OMNI printer. With CUPS I can only get black and white text, no images or drawings/graphs (yet... still playing around with options).
I'm certainly no expert on these things, but I was under the impression that when printing, the data from the app to the printer is the same regardless of the driver used and it is the driver that does the translation to the printer language. That is what led me to be more suspicious of the PSPRINT driver. Maybe someone more knowledgeable than I could chime in on this.
Your idea of print-to-file the same document from both versions and doing a compare sounds good. I'd be very interested in the results...
Regards,
Dave McKenna