Ted,
First of all, I'm VERY interested in knowing where you found the information that 'digitaleditions@adobe.com' was still used for support. That address was retired in April, but many people still send mail to it (and we don't know why).
Support is now available via web case only at http://www.adobe.com/support/digitaleditions.
The only error of this type I'm familiar with is documented here:
"Error converting license" when installing Adobe Digital Editions
http://www.adobe.com/go/kb403460
If that doesn't turn out to be the problem please open a web case.
Regards,
Bentley Wolfe
Senior Support Engineer, Flash/Flash Player/Digital Editions
Adobe