@Cary_D
You wee beauty, I set the A4 default paper size as suggested, and it's now working perfectly!
Had no idea Ghostscript's default was Letter, I don't know anyone who uses that paper size?!
Thanks for the updated FW Arexx script too, I'll give that a try.
I mainly use the Ghostscript front end by Michael Merkel (which also works well with GS850) so I get a nice GUI for print preview, convert to PDF, etc.
And thanks again Woosh, keep up the great work!