Okay, maybe I'd forgotten the location. I had thought it used to be one level up, I may be mistaken.
But just before I posted my question, I checked. And the file definitely *was* changed while I loaded a book onto the device with Calibre.
It seems something in Calibre (a device interface plugin?) is updating the conf file everytime I load a book. Replacing it with a default.
In principle that's fine -- if only I could find the menu in Calibre where I can specify *how* I want the conf file to be updated.
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