@MikeyH Hi Mike,
I'm not sure about this specific issue but we have already moved forward with native Inkscape integration of REXYGEN component.
Can you try out REXYGEN HMI Designer version 3.4.5? You can get it here: https://download.rexcontrols.cz/partner/daily/rexygen/hmidesigner/signed/
Kind regards,
Tomas