PFB Doors/windows in DEM

Here's another quirck with PFB in V8i;

I have a number of legacy PFB doors & windows matched to manufacturer product codes, that now do not display completely DEM Elevation extractions.  Only the frame appears, so it is not the Cut Plan toggle, or the Set Opening Indicator toggles incorrectly set.  I have applied different Parts and Symbology combinations withou there being any apparent effect on the output.  The frame manifests in theh 3D model, in plan extractions and renders well enough, but not in elevation.

Any ideas out there?

Patrick Wilson