Reply To: InDesign, Proportional Lining, and PageFlex?

I have no familiarity with PageFlex, but have you tried setting the options specifically in the Paragraph Style? On the OpenType Features pane, there is a dropdown for Figure Style. It defaults to, well, “Default Figure Style.” If PageFlex interprets the default as Proportional Oldstyle, then it may be overriding what was typed in the template. Defaults can create various kinds of havoc if they are defined one way on System A, then the document is opened on System B that has a different default.

It’s always safer to define things explicitly whenever possible (like creating a style called “Body Copy” for text, even if it’s exactly the same as InDesign’s “[Default Paragraph Style]”).