El Capitan will not restart or shut down.

I have the same problem on four devices: iMac27", mac Mini, MacAir and Macbook Pro.

Do not have any audio plug-ins, nor any anti virus software running.

is Apple addressing this?

An apple article is there : OS X El Capitan: Log out, sleep, restart, and shut down

Tried removing everything Wacom but it made no difference.

Not sure if mentioned elsewhere in the thread but this problem also affects updates that require a restart. iTunes 12.4.2.4 appears to have been installed four times according to App Update over the last two days.

'Tried'? Did you do this:

http://www.wacom.com/en-us/support/faqs/drivers-software/how-do-i-uninstall-a-dr iver-on-mac-os-x

Afterwards check for Wacom/Bamboo-related items in System Preferences > Users & Groups > Login, and remove these too.

No, I used App Delete followed by a manual search in Library which located a few related items. After doing that, I tried a restart which failed as usual. I then did a forced shut down and restarted. That was when I made the post - should have waited. I had another reminder that an update was available - 10.11.6 - so I clicked on restart and it did! As well as installing 10.11.6 (I was previously on beta so it looks as though I need to go to Sierra) it also installed iTunes again (five times in all now) but I no longer have any outstanding updates.

Thanks for the Users & Groups reminder - that has now gone as well.

TY

You're welcome.

Caffeine was the problem app for me. I shut it down, removed it from Login Items and now my machine (Early 2015 MBA) will restart/log out with no issue.

I've had this issue since my 10.9 install on my MacBook Pro. Sometimes, creating a fresh user account would temporarily address the issue.

I discovered that I also run the Digidesign CoreAudio driver for my old Mbox 2 Mini. I removed the "Digidesign CoreAudio.plugin" file and things seem to work for now.

I'll need to do some more digging to figure out whether I can continue to run that driver and/or use my old hardware given it's not supported by Avid anymore.

Thanks for posting the info. Huge help!

Thanks, Sr. Brits, you saved my life.

HI guys, how do you allocate the issue? Knowing which one making trouble on the system? Please advice, i tried to delete wacom completely , and update to the latest version, but still can't shut down. until today, i must shutdown it through terminal command. Please help.

Hi Ken

As previously stated somewhere in the post, delete everything Wacom and try restarting. In other words, do not reinstall Wacom. You are just repeating the same problem.

Cheers

TY

Ok, I just realised that i still have WacomTabletDriver, and I can't force quit to delete it. i can't be deleted too because it is always running. is there any way to totally totally delete this ? - Please help

Thanks for providing this info. But can somebody tell me how to solve this problem since Avid Core Audio plugin is important for other audio software(i.e. Logic ProX) to use Avid's interface. It cannot be removed. Otherwise, the sound of other audio software won't come out from Avid's audio interface to main speakers. Does anyone have solutions?

I've had this same issue (without any trouble from audio plugins). I reset my PRAM and the restart/shutdown is now working properly. Hard shut down (holding the power key until your computer turns off.) Turn on your computer and hold down the CMD+Option+P+R keys at the same time. Release keys after the second startup tone. Login normally.

This worked for me too!

Thanks Sr. Brits!