I, too, was having problems sideloading certain ebooks to my nook. In my case, it had nothing to do with an SD card, as I'm only using the nook's built-in memory.
For me, the problem seemed to be with PDB books. I'm not sure why, as the nook is supposed to recognise eReader format, but any time I tried to transfer books to my nook, it would keep "Checking for New Content" indefinitely. But if I transfer the same books after converting them to EPUB, they would go over without a problem.
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