Quote:
Originally Posted by Theeo123
It seems to do so if I Save to disk, but not when I send to device 
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Are you sure?
I've noticed that some eReaders cache metadata for books in their own internal database (or some other scheme). So if you just changed metadata for a book already on your device, and then just replaced the file, the device might not reprocess that book to change this cached data.
On my Kobo, I've noticed this happen a couple times. Removing the book from the device, and then re-adding it (rather then just overwriting the file already on the device) forced the Kobo to reprocess that file, and the updated Metadata did indeed show.