It's probably neither. Have you tried shutting down and restarting your Nook? Then sync your apps. You say the app store is not loading, and I am not sure what you mean by that. App's are purchased thru shop. Are you able to access and browse shop?
OH! I did not realize I wasn't doing a 'real' shut-down and restart. I found on another post that to hold the power button for approx. 20 seconds for a full-shut-down and restart. It seems to have resolved the problems. The store is loading properly and my App and my book are both on the NC now. Thanks for your help!