Forgive the dumb questions but when you side load the books through Calibre, does a green check show up to indicate the book has been loaded?
What folder do you have Calibre set to look for on the tablet when you have the tablet connected?
When you are looking in the Library in the Nook app on the tablet are you looking in 'My Files' for the side loaded books?
Do you have a SD card?
I have the same tablet and have books loaded onto the SD card in the Nook folder without creating a Books folder either within the Nook folder or as a separate folder not in the Nook folder.
The side loaded books show up in the Nook app on the tablet and are shown by Calibre as being on the Nook when I plug in the tablet to my desk top computer after the tablet is turned on and I set it to transfer files by the USB cord.
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