Has it ever downloaded? I know if you don't have a credit card associated with your account it won't download.
I have the same problem with the NY Times. False starts, then no download. I actually emailed tech support 3 times and never received a response. Usually I can download the paper later in the day, which doesn't help. Often the paper hasn't even been e-delivered by the time I head out to the train. This I simply cannot understand. The Times people can get hard-copy papers to every little deli and newstand in New York before 6am but not the electronic version? I suspect the B&N people are more to blame.
Sorry I don't have an answer for you, but I rant with you in solidarity.