10.9.3 kills third monitor

Same here: nice one, Apple..

New MacPro, 2 Samsung monitors via TB (mini DVI) and a 50" Panasonic LCD via HDMI. Two out of three work..

Does that mean they are fixing it, or they are just stalling for time?

(hands waving furiously, hey Apple engineering team, please notice this issue...)

Just off the phone with Apple Support about my third monitori no longer working after installing 10.9.3.

They are away of the problem and hope to have a fix by the end of the week.

They offered to walk me through a time machine back up to before the 10.9.3 update was installed, but that would mean any work saved since then would be lost.

I'll wait until the end of the week.

Martin

Also having this problem with 10.9.3

My Setup:

30" - mDP to Dual-Link DVI Adapter

24" - mDP to DVI Adapter

24" - mDP to DVI Adapter

only 2 of the 3 will work at one time.

Also having this problem with 10.9.3. Originally had four monitors functioning early Monday morning. After the 10.9.3 restart, down to 2 of the 4. Tried every reset, OS X reinstall, reboots, and cursing.

24" - Active Mini DisplayPort to HDMI Adapter

24" - Active Mini DisplayPort to HDMI Adapter

20" - Active Mini DisplayPort to DVI Adapter

20" - Active Mini DisplayPort to DVI Adapter

Have an open case with a senior advisor. I'd be happier if someone just told me it was a known problem with 10.9.3 and an update is imminent.

My last attempt at a fix, recommended by a senior advisor, was to reapply the 10.9.3 combo update (http://support.apple.com/kb/DL1746). After wasting 1 GB of my monthly allotment I can confirm this had no effect either.

Our current options include finding a copy of 10.9.2 we can reinstall, using time machine to go back to 10.9.2, or waiting until 10.9.4 and hoping that includes a fix.

I have no usable time machine backup for other reasons, so I'm left with a 10.9.2 reinstall if one is available or waiting and hoping for a 10.9.4 and forlornly looking at two dark screens.

So I was in the same boat as most here. 4 monitors worked fine on 10.9.2 broke on 10.9.3. Only could get 2 to work, no matter what I tried.

I had the following hookup

• 2x Active Adapter to DVI cable
• 1x HDMI
• 1x Mini Displayport to DVI cable

I did finally get 3 working again.

I am now using the following arrangement

• 2x Mini Displayport to Displayport
• 1x Active Adapter to DVI cable

Sp just changing the cables to use Mini Displayport to Displayport has solved this for me. I will try to get the 4th working soon...

Interesting....

I, too, filed a bug report with Apple as soon as I ran into the third display not working issue on my nMP and 10.9.3.

In my own situation, my configuration consists of 3 idential 27" LG monitors running at 1920x1080 resolution.

I have one attached directly to the HDMI output on the back of the nMP, a second using a standard "pigtail" type connector that goes from Mini DisplayPort to HDMI, and a third using Apple's Dual Link Mini-DP to HDMI adapter (the $99 one).

It all worked great in 10.9.2, but after upgrading to 10.9.3 and losing my third display, I tried many combinations of plugging things into different ports to no avail. I could always get 2 displays to work but not the third.

In my case, Apple Engineering just requested today that I take a photo of how everything is hooked up in the back of the machine and send it to them. (They haven't yet closed out my ticket as a duplicate.) I'm thinking at this point, they're just collecting data on various configurations of displays and adapter types that are failing?

I don't have the option of using straight-through Mini-DP to DP cables because my LG displays don't have Displayport connectors on the backs of them. (They only have VGA, DVI or HDMI.) I think I do have a Mini-DP to HDMI straight through cable around here someplace, though. I wonder if anything would change if I tried using that in place of the display connected directly to the HDMI port on the back of the nMP?

For now though, I used Time Machine and rolled back to 10.9.2 ... so I may just wait and see if Apple gets this fixed by the end of the week.

I did a fresh install of 10.9.2. I have all four monitors working again. I won't be so quick to assume these releases are well-tested next time, that's for sure.

Are you using Gigabit Ethernet speed? Network Utility can tell you your ACTUAL connection speed.

Gigabit Ethernet connection requires cables with all 8 wires present, and cannot use Power-over-Ethernet on the same cable.

Once you have achieved Gigabit speeds, you should also set Jumbo (9000 byte) frames).

James Weisbin2-

Thanks for your comments. My post above is not generally applicable to all the display problems listed here.

I was responding directly to Steve Gulik's comments directly above, indicating that it would take him 9 hours to do a restore from Time Machine. It should certainly not take that long with Gigabit Ethernet enabled.

he indicated he has an Apple Time Capsule and a Mac Pro. Both of those should support jumbo frames without issue. If other equipment will not, it generally will negotiate down to a lower frame size that it can support.

Just off the phone with Apple Care. Third time calling about this problem. This time they escalated the issue to a senior advisor. He reiterated the only solution is a restore to a date previous to installing 10.9.3. He had no ETA on a fix. He offered to escalate the request for help to the Apple engineering folks with the caveat that it will be up to four days before he gets a response. I will post what I hear when I hear back.

Martin

Mac Pro Desktop Computer (Six-Core) connected to three Dell U2312HMs.