In addition to ProBackup's instructions, removing and purging iPhone Configuration Utility seems to help (from here) :

1. Delete iPhone configuration utility.

2. Purge files related to iPhone Configuration Utility :

sudo rm -rf /private/var/db/receipts/com.apple.pkg.iPhoneConfigurationUtility.*
rm -rf ~/Library/Preferences/com.apple.iPhoneConfigurationUtility.plist*

3. Delete the whole folder:

sudo rm /System/Library/Extensions/AppleUSBEthernetHost.kext

4. Reinstall iTunes (just over the previous one)

5. Restart

In addition to ProBackup's instructions, removing and purging iPhone Configuration Utility seems to help (from here) :

1. Delete iPhone configuration utility.

2. Purge files related to iPhone Configuration Utility :

sudo rm -rf /private/var/db/receipts/com.apple.pkg.iPhoneConfigurationUtility.*
rm -rf ~/Library/Preferences/com.apple.iPhoneConfigurationUtility.plist*

3. Delete the whole folder:

sudo rm /System/Library/Extensions/AppleUSBEthernetHost.kext

4. Reinstall iTunes (just over the previous one)

5. Restart

In my case, I did not have the iphone config util so instructions #3 - #5 worked fine !