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I have never had this problem before.
System extension cannot be used
The system extension “//System/Library/Extensions/AppleUSBEthernetHost.kext” was installed improperly and cannot be used. Please try reinstalling it, or contact the products vendor for an update.
This was the message that appeared after I installed the new iTunes Update for 11.4 today.
I have an iMac 2.7 GHz Intel Core i5 with 8 GB memory, I have System 10.9.4
I reinstalled iTunes after removing the AppleUSBEthernetHost.kext and same message. I went back and looked at the previous version in Time Machine of the file and it was the same 7.0. Everything seems to be working okay. Any suggestions are appreciated. The forums had 3 other people write in with no solutions.