Rich,
I think the rendering mode allows text that uses normally visible glyphs to be invisible (maybe to insert a hidden sort of "watermark" or to overlay OCR text over a scanned image to retain the image but have searchable text).
The problem is that every check (at least that I know of) in either Acrobat or Pitstop doesn't regard the invisible segments as being any different than the rest of the text. It's in the normal rendering mode, it has a fill color, but it just doesn't show up because it uses an empty glyph. If only there was a way to check for text segments that use or do not use a specified character. This leaves the height as the only dividing attribute (and then only for exactly horizontal text).
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