Fortunately, it did not get a chance to erase what was on the Kindle, so this time (as opposed to previous), I didn't have to start all over. (With 300+ books on the Kindle, it's a bit of a pain.<G>)
I moved to a different computer to make sure there wasn't any legacy (central shared Calibre database on my Windows Home Server.) Used import on this computer, and got the Kindle collections back into Calibre. Now set to Create for your Collections plugin, and that seems to be working. What I am going to avoid completely is directly editing the Kindle collections file. That seems to be what triggers the issue. Plus it's a royal pain to do anyway, so better to do all the manipulation in Calibre.
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