Thunderbolt ethernet not showing up in network preferences

this is happening with both my thunderbolt display and thunderbolt<->ethernet adaptor....
the ether net in the t-bolt display WAS working.... but was having probs with the ethernet adaptor while on the road, so I tried deleting the thunderbolt ethernet entry from the Network Preferences panel. Well, now when I hook up my thunderbolt Display, the option doesn't re-appear! So now I'm thinking there's something in the system that's keeping that from re-appearing in the network preference panel, and it could be the reason for both items not working.
The controller is recognized at a low level by the system - in system report I get:
Apple 57761-B0:
Name:          ethernet
Type:          Ethernet Controller
Bus:          PCI
Slot:          Thunderbolt Slot 2@11,0,0
Vendor ID:          0x14e4
Device ID:          0x16b0
Subsystem Vendor ID:          0x106b
Subsystem ID:          0x00f1
Revision ID:          0x0010
Link Width:          x1
BSD name:          en2
Kext name:          AppleBCM5701Ethernet.kext
Firmware version:          57761-a1.48, 0x2fe676f9
Location:          /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleB CM5701Ethernet.kext
mDNS offload capable:          c8:2a:14:4f:a3:90
Version:          3.2.4b8
So it's a problem with the Network Preferences panel getting loaded, somehow.   I tried re-creating the kext cache, that didn't help.
Digging around a little in the system, I see this:
cd /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/
$ ls
AppleBCM5701Ethernet.kext          AppleYukon2.kext
AppleIntel8254XEthernet.kext          IOEthernetAVBController.kext
AppleUSBEthernet.kext                    Intel82574L.kext
AppleUSBGigEthernet.kext          nvenet.kext
But I'm out of ideas how to get the thunderbolt ethernet option back into the Network Preference panel. help?!

I also tried disconnecting the display and adding it back and rebooting - nothing worked.
But here's a bizarre twist: I show "Bluetooth PAN" connected and active, and it's coming from the Thunderbolt display! I can get online. Then I disconnect the network cable from the display, and test again - no network. So somehow, the driver for Bluetooth PAN is totally confused with the display Ethernet. In fact, the Bluetooth PAN shows connected, and "No PAN devices found". So I'm connected to a phantom device.
Maybe deleting the PAN and display, adding back the display, will get it to recognize it properly.
The short of it is I have Ethernet connected now through the display, but using the Bluetooth PAN device driver.

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