Internet Sharing broken (prefs day working, no natd or IP set)

Hi,
Currently I am unable to get internet sharing working at all. I have a connection from Airport that I am trying to share to Built-in Ethernet. I have the firewall turned off. I setup the connection in the Sharing Preference Pane and it looks to have worked fine (I get the confirmation, hit OK and the Start button becomes Stop).
However Built-in Ethernet does not have an IP address (totally empty) and pa awwx | grep -i natd shows that natd isn't even running. It's like the preference pane gives a total no-op, not even a log message that I can find.
I've checked system.log and console.log, nothing there. I've trashed networking and sharing preferences, run software upgrade and fixed disk permissions.
I suspect it is related to Parallels or VMware Fusion, both of which were installed at various points but have now been uninstalled. There are no interfaces out of the ordinary. However the drop down list in the Sharing Pref Pane still shows en2 and en3 as possible sources (but the Network Pref Pane doesn't list these as interfaces at all), this persists after removing the preferences (are these, perhaps, stored in NetInfo somewhere?).
Any similar experiences? Any ideas on how to get this working again would be appreciated.
Thanks,
James

I've found that any one or more of these can affect that...
/Users/nnnn/Library/Preferences/com.apple.internetconnect.plist
/Library/Preferences/SystemConfiguration/preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
/Library/Preferences/com.apple.sharing.firewall.plist
/Library/Preferences/com.apple.networkConfig.plist
With those extra Interfaces stored in the 4th one... or created by some Startup/Login Item, like third party Adapters & such.

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