Hi!

No, it does not work in Stylus Studio (The latest copy).
The PDF rendered has no border.

<fo:simple-page-master master-name="main" margin-top="0.4cm" margin-bottom="1cm" margin-left="0.2cm" margin-right="0.2cm">

<fo:region-body margin-bottom="3cm" margin-top="0.5cm" border-width="0.1cm" border-style="solid"/>

<fo:region-after extent="2.5cm" top="0" left="0" width="10cm" height="20cm"/>
<fo:region-before extent="2cm" top="0" left="0" width="10cm" height="20cm"/>
</fo:simple-page-master>

Thanks

Dave