Hi again,
We upgraded from Mac OS 9 to X at the same time. [Maybe my wry comment about the benefits of upgrades are better directed to Apple]. The printers are the same- though we had to update the drivers to work with OS X. If you are familier with such issues, we'd appreciate any advice. In case it helps, the printers are Epson Stylus Colour 1150 and HP Designjet 450C- the latter driven by a UK based software called Microspot X-Rip. It's worth noting that the solid colour fill overlays disappear on print preview irrespective of the printer selected. Graded fills behave as if in 'paint' mode.
Thanks, Nick.