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I have three 30" displays, but after the 10.9.3 update, only 2 of them work at a time. Is this a known issue? Can I downgrade to 10.9.2 to get the use of my other display back? It was working just fine on my Mac Pro with 10.9.2.
Mac Pro
Restore your backup.
Barry
I am having the same problem. I have 4 30" ACDs but only 2 of them work. I time machined back to 10.9.2 via a restore and all is good on 10.9.2. Kinda stinks we can't update to latest software though.
I am now seeing on multiple forums that others trying to run either 3 or 4 displays only get the first two working. I have reported this on bugreport.apple.com - suggest you do the same. Feel free to include my report number 16933298 in yours.
Same problem here. Two 24" NEC screens and one 30" DELL U3011. Can have any two, but not three working.
Have filed it under bug report number 16935432, and referenced your 16933298.
No problems with 10.9.3 on a nMP with a Dell 30", HP 30" and a iMac 27" used as a monitor.
I have already received a response to the bug report from Apple, asking for more information. Good to see such a quick response. This is a pretty important issue for me, so hope they can fix it quickly.
Still, the more people who report it, the higher priority I expect they would give to it, and maybe be able to get different configuration information to enable them to track it down more quickly.
I can't get two monitors to work with 10.9.3 I thougt I was just updating iTunes but that was not the case. So don't have a back up.
I came back into my office after taking a break to find my computer rebooting itself. I was upset because I knew the work I had arranged between my 5 monitors and 6 desktops would be in disarray. However I could not have imagined that I would find all of my work stuffed into one desktop and two monitors. Thank goodness for time machine back-up. I got everything back and into their appropriate spaces. Even though I was able to recover, it still cost me over two hours of valuable work time. I have blocked the app store and the update agent from being able to send or receive data in order to ensure nothing like that ever happens again. This is the type of thing that used to infuriate me about Windows and the primary reason I switched to Apple. My monitors are hooked up using Apple's active DVI adaptors per their connection instructions. This should not have happened.
I got my displays working again by deleting the Geforce and NVDA kexts from system extensions and re installing the ones from 10.9
Same problem, with four Apple displays. Only three of them work now with OS 10.9.3.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Anybody have the 10.9.2 Geforce and NVDA kexts so I can try what "gatd4" (above) did?
I'd be up for trying them to see if that fixes the problem. And then perhaps I could put together instructions for others (should be pretty easy using kext wizard anyway)...
Yes, if you can try it these kexts from 10.9.2 and put some instructions for others it would be really nice...
down load kext utility here http://mac.softpedia.com/get/System-Utilities/Kext-Utility.shtml
download Kexts here https://www.dropbox.com/s/a510p6a9immdboc/Kexts.zip
unzip the file
delete all Geforce and NVDA kexts located in your system/library/extensions
open kext utility and drop the all the kext files you downloaded on the window
wait till complete
reboot
now all monitors working again!
10.9.3 only lets me use 2 of my 3 30" displays
