Upgraded to iTunes 11.4 and now it won't sync my iPhone 5s-sync button is greyed out.

II'll give this a try tonight and confirm if this fixes the same issue I have....

I remember seeing an error message the first time I installed iTunes 11.4 and it points to the AppleUSBEthernetHost.kext. The error message basically says try to reinstall the program.

I tried removing the 11.4 version of AppleUSBEthernetHost.kext and re-installed the previous version. It didn't work. I still couldn't sync my phone.

But now, I remember I forgot to reboot after restoring the older file (that's why they're called kernel extensions, duh!).

This looks promising. I'll try this tonight. Thanks.

I think at the very least you're going to need to remove the 11.4 version of AirTrafficHost (/System/Library/PrivateFrameworks/AirTrafficHost.framework) as well. When I had 11.4 installed, the "iTunes Helper" app was constantly - and silently - crashing and respawning with errors in the system log (/var/log/system.log or "All Messages" tab in the Console application) implicating "ath" or other parts of the AirTrafficHost component.

The installer takes care of everything needed to reload the kernel extensions, so a restart isn't required.

"I upgraded to iTunes 11.4 a day or two ago, and now I'm not able to sync my iPhone 4. [...] I'm running Snow Leopard (10.6.8) on a 2006 iMac Intel Core Duo with 2 GB memory."

Carl, you have a 32-bit machine that only runs a 32-bit OS, and the broken iTunes 11.4 AppleUSBEthernetHost.kext is 64-bit only - so you have no choice but to try and restore the iTunes 11.3.1 version of that kext.

I am not sure what would happen if you tried running iTunes 11.4 with the older 11.3.1 AppleUSBEthernetHost.kext - they are usually matched to each other so unpredictable results could potentially occur.

Unfortunately, as can be seen in this thread, removing all of the iTunes 11.4 bits so you can do a fresh restore of iTunes 11.3.1 is pretty painful!

"I think at the very least you're going to need to remove the 11.4 version of AirTrafficHost (/System/Library/PrivateFrameworks/AirTrafficHost.framework) as well. When I had 11.4 installed, the "iTunes Helper" app was constantly - and silently - crashing and respawning with errors in the system log (/var/log/system.log or the "All Messages" tab in the Console application) implicating "ath" or other parts of the AirTrafficHost component."

cwa2 - really? Can you say what machine and OS you are seeing this on?

I'm on a Mac Pro with 10.6.8, running with the iTunes 11.4 versions and I'm not seeing those same ATH messages, so I'm curious why you are.

Greg Earle, I was seeing the ath errors on a 32-bit Mac Mini (Core Duo), stemming from the iTunes Helper. They look like this:

[0x0-0x98098].com.apple.iTunes[3234]: ATHostConnectionDestroy 0x1e361f40

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x30eab0 of class NSCFString autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.756 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x30eab0 of class NSCFString autoreleased with no pool in place - just leaking

ath[3247]: -[ATLegacyMessage setResult:]: unrecognized selector sent to instance 0x30e690

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x31b980 of class NSCFString autoreleased with no pool in place - just leaking

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x311f20 of class NSException autoreleased with no pool in place - just leaking

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x31b6c0 of class _NSCallStackArray autoreleased with no pool in place - just leaking

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x30ea60 of class _NSCallStackArray autoreleased with no pool in place - just leaking

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x311ec0 of class NSCFString autoreleased with no pool in place - just leaking

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x810600 of class NSCFString autoreleased with no pool in place - just leaking

ath[3247]: *** __NSAutoreleaseNoPool(): Object 0x311f00 of class NSConcreteMutableData autoreleased with no pool in place - just leaking

ath[3247]: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ATLegacyMessage setResult:]: unrecognized selector sent to instance 0x30e690'\n*** Call stack at first throw:\n(...)

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.763 ath[3247:1e03] -[ATLegacyMessage setResult:]: unrecognized selector sent to instance 0x30e690

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.764 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x31b980 of class NSCFString autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.765 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x311f20 of class NSException autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.765 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x31b6c0 of class _NSCallStackArray autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.765 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x30ea60 of class _NSCallStackArray autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.765 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x311ec0 of class NSCFString autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.766 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x810600 of class NSCFString autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.766 ath[3247:1e03] *** __NSAutoreleaseNoPool(): Object 0x311f00 of class NSConcreteMutableData autoreleased with no pool in place - just leaking

[0x0-0x98098].com.apple.iTunes[3234]: 2014-09-11 00:34:24.766 ath[3247:1e03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ATLegacyMessage setResult:]: unrecognized selector sent to instance 0x30e690'

[0x0-0x98098].com.apple.iTunes[3234]: *** Call stack at first throw:

[0x0-0x98098].com.apple.iTunes[3234]: (

[0x0-0x98098].com.apple.iTunes[3234]: 0 CoreFoundation 0x97a446ca __raiseError + 410

[0x0-0x98098].com.apple.iTunes[3234]: 1 libobjc.A.dylib 0x917535a9 objc_exception_throw + 56

[0x0-0x98098].com.apple.iTunes[3234]: 2 CoreFoundation 0x97a9190b -[NSObject(NSObject) doesNotRecognizeSelector:] + 187

[0x0-0x98098].com.apple.iTunes[3234]: 3 CoreFoundation 0x979eac06 ___forwarding___ + 950

[0x0-0x98098].com.apple.iTunes[3234]: 4 CoreFoundation 0x979ea7d2 _CF_forwarding_prep_0 + 50

[0x0-0x98098].com.apple.iTunes[3234]: 5 AirTrafficHost 0x001837ec -[ATLegacyMessage initWithDictionary:] + 300

[0x0-0x98098].com.apple.iTunes[3234]: 6 ath 0x000028f3 0x0 + 10483

[0x0-0x98098].com.apple.iTunes[3234]: 7 AirTrafficHost 0x001844bf ATProcessLinkRunChild + 112

[0x0-0x98098].com.apple.iTunes[3234]: 8 ath 0x00002856 0x0 + 10326

[0x0-0x98098].com.apple.iTunes[3234]: 9 Foundation 0x9a8df4c4 -[NSThread main] + 45

[0x0-0x98098].com.apple.iTunes[3234]: 10 Foundation 0x9a8df474 __NSThread__main__ + 1499

[0x0-0x98098].com.apple.iTunes[3234]: 11 libSystem.B.dylib 0x93c93259 _pthread_start + 345

[0x0-0x98098].com.apple.iTunes[3234]: 12 libSystem.B.dylib 0x93c930de thread_start + 34

[0x0-0x98098].com.apple.iTunes[3234]: )

ReportCrash[3243]: Saved crash report for ath[3247] version ??? (???) to /Users/viewer/Library/Logs/DiagnosticReports/ath_2014-09-11-003425_macmini.cras h

com.apple.usbmuxd[36541]: MuxNetworkInitiateConnect failed to set traffic class SO_TC_BK_SYS : 22 - Invalid argument

"Greg, I was seeing the [AirTrafficHost] errors on a 32-bit Mac Mini (Core Duo), stemming from the iTunes Helper."

Ah, interesting. Boy, you 32-bit machine owners are really getting hosed by this whole debacle, aren't you? 😮

I checked that Framework and yes, iTunes 11.4 updated it, on my system it's showing as being Universal (both AirTrafficHost.framework/ath and AirTrafficHost.framework/Versions/A/AirTrafficHost) so at least they didn't botch that up with a 64-bit only bungle! 😕

sweet worked a treat! I'm back up and running again. I will avoid the upgrade for now me thinks. Cheers again to cwa2

For anyone having this issue and desperate to get a fix, I'd follow cwa2's guidance, it's really simple (even for me) and worked a treat.

Thanks once again, cwa2!

did the cwa2 thing - EXCELLENT you are a wizard!!!!!

Great directions, did caw2's repair in 10-minutes, after 6-hours of doing what everyone else was trying, (three of those with a pair of unaware Apple techs)

I kept a copy of those 'pesky' files in a folder for safe-keeping, just incase I've launched a deeper bug somehow...

AWESOME HELP: I also used the command + shift + G in Finder to find all of those files, removed them.

RE: 11.3.1, | Download 11.3.1 from *********************

🙂 ++++ All is well ++++ for now ++++ I guess Apple is just leaving/dumping us 32-bitters in the 'bucket' huh?

Thank you Thank you Thank you!

<Link Edited by Host>

My only issue is this: when iOS 8 comes out, will those of us with 32 bit machines be able to sync with 11.4? If they don't update it with 32 bit compatibility, what does that make of say, an iOS 8 device trying to sync with a 32bit Mac running Snow Leopard?

I think not having 11.4 will be more of an issue if syncing to the iPhone 6 or iPhone 6 Plus. Devices on the iOS 8 Dev GM Seed seem to sync correctly with 11.3.1 on 32-bit hardware. I haven't observed any loss of functionality.

Ah, that is good news to hear. I'm going to try your solution to the itunes issue shortly..will return with results.

CWA2 this is brilliant. Works a treat. Even someone without any computer knowledge can do this.

Thanks very much.

Hope Apple doesn't do this again to us 32bit people on 10.6.8

hi cwa2, thanks for the cool way you found to restore eberything back to normal and i'm glad it worked for everyone, but alas myself: i tried your way and now my macbook pro seems to be broken 😟 i have a 2006 macbook pro, 15" intel core duo, runs with snow leopard. I couldn't find the "/System/Library/CoreServices/CoreTypes.bundle/Contents/LIbrary/MobileDevices.b undle anywhere (not even my mac found it, not even with the Go to function) so i went ahead and deleted all the other suggested parts. I was REALLY careful just to repeat your steps and double checked every file.

What happened after: First, my dock disappeared, my mac uses at least double the time to work tasks, then safari kicked the bucket (somehow deleted from programs - nowhere to be found) i still had the itunes 11.3.1 version in my downloads, so i tried to start this, but it gave me an error note that it couldn't install.

i work with time machine and tried to import the "before-ground-zero" version, but my mac wouldn't even let me start in "recovery mode" (command + R)... i seriously need your help - how do i import my "good" back-up before the 11.4 itunes update?! thanks a lot - turning to you since you really seem to know your way around our machines.....