Check the FAQ's in the Adobe Digital Editions Help section (F1 key when ADE
is open). Some features in PDF documents aren't supported by ADE (it's at
Reader 5) and some work only with certain types of text. I'm guessing
that's the reason.
Hope this helps!
I had very same problem, but finally resolved it.
I read that ADE was compatibile with PDF/A only, so I made a PDf file with compliance test and got a message:
<PDFA ISO="19005-1:2005" COMPLIANT="false">
PDF/A Compliance Report
Violation. The output intent profile was not specified.
Violations: The total found in this section was 1.
Warnings: The total found in this document was 0.
Violations: The total found in this document was 1.
This document does not pass PDF/A-1b:2005 compliance checks.
so I resaved my jpeg files with NO COLOR PROFILE and... it worked!