...and, for the sake of closure, I will report that I was able to generate detailed output using Kovid's suggestion, which allowed me to figure out that the problem I was experiencing with DeDRM was due to, um, stupidity on my part.
I hadn't added any DRM'ed books for quite a while and had neglected to add the serial number for my NEW Kindle. So when I downloaded the books recently, specifying my current device, the plugin didn't have the key it needed. Once I saw the messages output in debug mode it only took a couple of minutes to figure out the problem.
Thanks to everyone!
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