iPhone 4 Tethering Help?

[appleguru1]

Ok, so I have a factory unlocked iPhone 4 and I've enabled tethering in network settings. Tethering over bluetooth works great, but I cannot get tethering via USB working on this machine (15"MBP, 10.6.4) at all. I'm missing the network interface in System Preferences, and unplugging/replugging/rebooting doesn't seem to help. Another machine I have here running 10.6.4 works just fine with the same phone for USB tethering.. any ideas?

 

[appleguru1]

Got it sorted.. for whatever reason, apple's tethering kext is 32 bit only... I've been using the 64 bit kernel for a while; switched it back and all is peachy.. Cheers to an old post on the apple forums for illuminating this!