Kindle info from Amazon doesn't list AZW3 but it was in the list of acceptable files in my Calibre. Either the list was overwritten in the latest update or by chance I never downloaded an AZW3 file before. Anyway I deleted all the invisible titles from the Kindle, converted all the new ones to go from Calibre into MOBI and sent them all in one hit. It's working fine now thanks everyone.
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