Run mobile project on Android 4.2 (Nexus 7) on OSX

I cannot get Flash Builder (4.6 or 4.7) to recognize my Nexus 7, plugged into my MacBook (running OSX 10.6) via USB.

I followed the instructions here:

http://developer.android.com/tools/device.html

and can see my device from the command line via 'adb devices'.

I also ensured that my Android SDK /platform-tools folder is in my $PATH.

However, when I set up a run config to test directly on the device, the Choose Device dialog appears, with a message that 'Flash Builder could not find a connected device'.  I followed the instructions here:

http://help.adobe.com/en_US/flashbuilder/using/WSe4e4b720da9dedb5-2e73 10a1136ab7c1811-7ff3.html

and see on my Nexus that USB debugging is connected.

I'm not sure what else to try at this point.  Any clues?