Multiple display problem in OSX 10.9.2

Nearly the same here. I've an external display connected to my private iMac via mini displayport respectively two external thunderbolt displays connected to my iMac for work. Before the update to 10.9.2 everything worked fine, afterwards the screen turns from black to the normal display to black and so on, it's flickering every time I do something, open up an app, repositioning a window from one display to another, switch to fullscreen. This totally *****, as an Developer and UI designer I'm depend on two respectively three displays o.O

My friend just upgraded, and while the second monitor works, (15" Retina macbook Pro and 27" Display (displayport version, not TB version), if selects mirroring, the MacBook display sets to the same resoluiton of the external display, but the external display goes black. Turning mirroring off does not correct it, the only thing he can do is unplug the 2nd display and plug it back in. When he does this it resets the defaults of the displays, so he has to go to arrangement each time.

PITA for someone who teaches a lot, not sure if it is going to be a problem with a projector or related to the display. Something broke ... appears they rushed this update out for the SSL issue without testing enough.

edit: just tried this with the newer Thunderbolt display, same problem.

FEEDBACK http://www.apple.com/feedback/macosx.html

Pete

YES, send them the feedback. No one from Apple ever looks at these forums. You MUST report your problems using the link Petermac87 gave.

Having this same issue. External display connected via mini-display port to Dual-Link DVI adapter. System hangs at startup with monitor plugged in and laptop screen goes black when I attempt to connect it after login. Feedback sent.

I have the same problem, if I plug in the adaptor both screens go black and the MBP stays black even after unpluging the 2nd screen, I have to force a restart.

Sort it out Apple.

Hey athomas1,

Have you tried a SMC and NVRAM/PRAM Reset? You can also try booting to Safe Boot to determine if any Third Party applications are affecting your monitors.

It does seem like from all the reports 10.9.2 has some sort of problem with the 2nd monitor.

I had a the same prolem on my Macook Pro Retina. The 2 external Dell displays connected via my thunderbolt port remained black and undetected by the OS. I restarted and tried again, no luck. Unplugged the cables and connected them after a while, it started working fine!

Update in my case:

I've downgraded my iMacs to 10.9.1 via Recovery and Time Machine, and here's the glue -> EVERYTHING WORKS FINE AGAIN! Just the notification 'bout 10.9.2 is annoying, but there's no chance to disable the notifications for the Mac App Store.

So, here's my advice for you, guys: try to downgrade to Mavericks 10.9.1, manually update Safari to 7.0.2 ('cause of the SSL security bug) and wait with the update of OS X til 10.9.3 xD

Regards from Germany

t.

iMac 27, 2nd monitor not working after 10.9.2 upgrade.

Just thought I'd add to the pile.

My second monitor issue is slightly different, at least mine works but the resolution is wonky (oversized). The monitor is an HP 27xi, not Mac friendly from the start, but before 10.9.2 upgrade worked perfectly after some setup issues. Now the Scaled resolutions are 1080p, 720p and 1600x900, all which produce an image larger than the monitor, to the point of not being able to see the dock or menubar. My connection is HDMI. Same issue when mirrored.

Similar issues here. I usuallly use an external dispaly as secondary display, but updates when secondary was not attached. restart to black screen , couple flashes of an apple icon but nothing.. didnt sleep well. this morning came to office and plugged secondary in, secondary monitor working fine but primary still black. First bootup took a while to get it started I guess since first successful boot after upgrade. Going to try another reboot.

No problems with a second monitor here.

For those of you with this issue, have you checked your Display preferences? Some users have reported monitor assignments have been reset to defaults and they needed to drag their monitors back into place and reset some settings.

That did it.. The setting on the laptop display had auto brightness disabled and screen brightness was reset down to "0" Thank you .