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!