same problem here- it used to sync between the nook and the iphone app and the mac - no longer. Perhaps since the most recent upgrade? nook2 does not sync either
I asked a similar question was told by support that syncing between platforms is not supported. I was under the impression that it was a feature.
Now, was that there way to get me off the phone? Seems like a reasonable expectation to have given B&N's hype.