I had no problems with loading the book. Try archiving and unarchiving it first then turning your NC off and on. My NC is not rooted.
I had no problem loading it to a original nook and a nook color (both stock B&N 1.4.1 and CM7 with the nook app). Since you had it fail on two devices, I wonder if there was a temporary internet or web site glitch. If so, try again.