This is a bug! To import to DNG from a batch or file full of images, you have to make sure none of them are DNG when you start, and make sure they are not converted raw images. The recommended best method here is do the import as original raw jpeg (if that is the file format) and then do the post-import conversion to DNG see the following link for more information, and pay special attention to the section: "Converting to DNG after import"
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I do not attempt to answer what I cannot; however, I am no miracle worker, though some days it may seem so. Probably a stupid question, but have you tried copying the files to the computer BEFORE importing? A number of things could be mucking up the import, eliminate the variables. If you wish, I can submit a refund request at your request, otherwise, I am opting out to allow others a chance to see this question.
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