Blank Pages - unsupported PDF Feature

Borrowed a book from OpenLibrary.org   -- it's titled Longfellow Genealogy by Russel C. Farnham.  Two version are available - a low res and a high res. The Low res loads fine but has a lot of glyph errors in it.  The high res version loads as blank pages -- the text is there you can select it but it is not visible -- white on white background.  The Info for the file reads "unsupported PDF feature". 

The same thing happens on my Windows 7 as on on Mac OSX 10.6.8 machine, both running latest version of Digital Editions.

I read in one older post that the unsupported PDF feature can be due to using a font DE does not have -- Is this the same thing as using an embedded font?

This is most frustrating because I can see the text is there, but I can't read it because it is white.  Is there any way to find out what font it is looking for and/or authorize a substitution (assuming that is the problem).