system extension cannot be used AppleUSBEthernetHost.kext
I responded to the upgrade of iTunes today - to version 11.4. I did this in short succession on a Macbook Pro and iMac, both running Mavericks.
Silly me - Apple fails
On both machines I got an error message immediately after the upgrade as per the attached image
Suggestions on how to resolve this are most welcome
Oh - and somehow I cannot post to Apple Support Communities - go figure!
Thanks
MacBook Pro, OS X Mavericks (10.9.4), iTunes upgrade - 11.4