I've searched and haven't found this discussed, though I'm sure it has had to be. Over the weekend I side loaded (wirelessly via Samba) 5 epubs onto my SD card. They all show up in the Nook library but will not open. They do open in Aldiko. I don't have the NC in front of me know, but the error message I received was something to the tune of "can't open this book." I don't believe these books to be associated with a library in any way. Has anyone experienced something similar? Thanks!