@backseatgreg .. I don't have my N900 in hand yet, but have you even attempted to put the WLAN on the N900 in monitor mode?

I'm curious as to your outcome when running:

airmon-ng start <iface>

..then actually trying to run airodump-ng on the newly created VAP iface.

Also, would be nice if you could test & post back the output from this command:

aireplay-ng -9 -B <iface>

thx