see my blog - http://nbhufflerblogspot.com
I have had exactly the same problems. Now overcome them.
DO NOT PLUG BNOOK INTO COMPUTER
Download Overdrive Media Console from your Nook Shop if you do not already have it.
Authorise your Nook with your ADE ID (done when loading Overdrive)
Go on to web from Nook
Go to your library
choose books
checkout
download to Android
choose Overdrive
Hey presto you have your library books on your Nook in Overdrive Medial console