Yes, thank you, that worked perfectly. I have always kept Calibre up to date, but I didn't know which files were safe to delete on the device. I believe my Sony 700 is one of the older ones, since it seems to do just fine without the thumbnail files.
I'm not sure the bug was specifically related to SD cards, since I always send the books to main memory (I don't have any extra cards in there.) But I believe the main memory on my Sony is itself an SD card, so maybe the issue still applied.
At any rate, all is good now, and thank you again.
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