Mac Pro keeps logging out since El Capitan

I have the same problem Mac mini (Late 2012)
CPU: 2,3 GHz Intel Core i7

Memory: 16 GB 1600 MHz DDR3
Graphics: Intel HD Graphics 4000 1536 MB

OS X version: 10.11.2

Clean install of El Capitan.
Log out happens about 4 times a week.

I also have checked "Send diagnostic & usage data to Apple" but it looks like they ignore this information

Could it be fixed?

@MacProUserGrateful Well, you are most welcome! I just came back to this thread (26 pages long now!) to see if anyone had found success. I'm glad I was able to provide you a workaround to an incredible frustrating bug.

It sounds like 10.11.2 has resolved many of the monitor issues - so I am off to test (fire extinguisher at the ready).

I can't believe I missed this thread for MONTHS. I have a Mac Pro 2009 with two GT 120 stock from Apple. The logging me out issue was eventually resolved but I'm getting the crazy abstract expressionist type blurs on one monitor intermittently to the point of barely being able to work properly. Tried NVIDA web drivers, CUDA drivers, the Mission Control thing...nothing works. Applecare claims to not be aware of this and escalated to engineering twice and I've never heard back.

Moving the menu bar in the Displays system prefs relives this for minutes or sometimes hours but it always happens. again. Months of agony.

My Mac Pro (early 2008) is behaving itself finally (after months of not working properly with El Capitan) with the latest round of updates from both Nvidia for its driver and El Capitan from Apple. ((MacOS 10.11.3) and the Nvidia driver (346.03.05f01)

Previously, I had an Apple-ROM-flashed ATI Radeon HD 5770, and experimented with an additional Geforce GTX 750Ti (stock PC), which both resulted in sporadic logouts when I upgraded to El Capitan from Yosemite, although it became fairly stable by turning off the "Displays have separate spaces" functionality, although the system got non-fatal errors browsing within many applications' file opening dialog boxes...which I have been sending off to Apple, using the built-in crash reporting functionality within MacOS with Xcode installed.

Perhaps a factor in getting things working smoothly is that I decided to stop mixing card types - now I've only got Nvidia in the machine - it's currently got a Nvidia GeForce GTX 750Ti running two Apple Cinema 23 inch displays, and an old Nvidia GeForce GT 240 running a third. Both cards are standard PC cards, no flashing with Apple ROMS - these aren't "mac" cards.

I find it's good to have the older card in there, because I have found that the new GTX 750 displays nothing at all with the built-in Apple drivers in El Capitan. The GT 240, although it doesn't display the boot screen (as can be expected), once the OS loads, works fine in El Capitan without the Nvidia driver, whereas both cards would display video in Yosemite without the Nvidia driver.)

Happily working on all three cinema displays on my Mac Pro with "Displays have Separate Spaces", which I love, working fine now!

Isn't it the advanced log out feature found under Advanced in Security & Privacy?

I've disabled "Log out after # minutes of activity" on El Capitan (see screenshot) to keep my desktop session open regardless of time.

I did check the "Require an administrator password" to prevent normal users to change a locked system.

You might also want to check your Energy Saver settings; particularly under the Schedule... button that could cause your system going to sleep.

Has anyone tried just turning off AirPlay?

I followed a lot of the advice in this thread, so I can't say for sure what did the trick. But I was having the issue up until I disabled AirPlay. Now no more problem. Hopefully it stays resolved.

The majority of computers that were effected are to old to support AirPlay so turning AirPlay off is not an option.

Illaass, I don't think that is true. Airplay was introduced with the first Apple Airport Express. The original version (M9470LL/A, model A1084) was introduced by Apple on 7 June 2004, and I have one, which still works fine incidentally, and it can be administered within El Capitan with a hack made for Yosemite to launch the old administration software... http://coreyjmahler.com/2014/10/16/airport-utility-5-6-1-on-os-x-10-10-yosemite/

Although I suspect it has nothing to do with the display problems we are seeing. (I have Airplay turned on, but have never used it, and my MacPro is finally working fine in El Capitan (not sporadically logging me out), as I observed in an earlier post in this thread recently.)

I also noticed that I had an active Back to Mac screenshare open with my laptop. I shut that down as well, so that may have been the culprit (too).

This does not solve the issue either.

Apple has not taken care of the users with MacPros using double graphic cards or Raid-Systems.

I have been trying hard to get it running even with the wonderful support of the Apple Helpline.

And I tried every trick described on the discussion board.

It´s just like Windows, where computers are just not running with new OS. Therefore I gave up eventually and install Yosemite back - for workhorse purposes only.

Interesting though that my even older MacBook Pro showed no problems at all with running El Capitan.

I guess that´s life. We all have to give up our hardware at some time :-(

I think, FTW. .

took a few restarts on my end. . .

2008 Mac Pro on El Capitan's latest update

Once! (Once. . .) attached a second monitor. . .

gettin' to be Voodoo. . .

yes, the graphic cards burn quickly,

This has been happening to me, and none of the solutions has helped, I'm still getting random logouts. I never had displays set to separate spaces.

El Cap 10.11.3

5k iMac 4ghz i7

Second monitor: Apple Cinema HD 23"

Well super, now it's happening repeatedly.

Anyone good at reading system logs? I'm pretty sure it happened in here...
http://chrissyone.com/logout.rtf

I have the same problem 😟

Mac mini (Late 2012) (Intel HD Graphics 4000 !!)

2x Apple Cinema HD Display 23"

Just a heads up: I'm using two Nvidia PC video cards in my early 2008 MacPro, and it had been working fine with Yosemite (with the NVidia web drivers).

And after a rocky start with El Capitan, I've had it working fine for a few months, up to the latest system update.

The recent 10.11.4 update, along with the necessary Nvidia driver update that downloaded in the background also, blew things up totally for me - all three monitors started flashing uncontrollably.

Just wasted 3 hours re-installing the OS - an old download of El Capitan (which incidentally wouldn't install unless I turned the clock back on my Mac a year, and disconnected it from the web). Then I installed the update to 10.11.2, re-installed the older Nvidia drivers and everything is fine again.

Had to re-enter the passwords on my mail accounts also as a result (both in and out), and check all the "allow insecure connections" boxes, as that is checked now by default in El Capitan installs.