Fireworkz for Windows printing

[Martin]

I have recently got a new printer, an Epson XP-8700, which has a
Duplex 2-sided print capability.

With the printer properties set to 2-sided, when I print from
FireWorkz for Windows 2.32.02 (the latest), the setting seems to be
ignored and single-sided prints are produced.

I am trying to stablish if this is because of something I have, or
have not, done, or because FireWorkz is somehow ignoring it.

Has anyone else seen this, or have any suggestions?

Note that Duplex has been proven to work from LibreOffice.

Thanks
Martin