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Sorry, not very cleanly of me in terms of forum discipline, but I also posted this in the Calibre group, and it looks very much like installing the 64-bit instead of the 32-bit version of Calibre solved the problem. Someone said the 32-bit version might run low on memory uploading larger numbers of books at one time. And whether that was the problem or not: as soon as I installed that, I seemed able to upload more than a hundred with no problem. (By this time, I've uploaded the entire library.)
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