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Helpful answers
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Dec 19, 2015 9:53 PM in response to Stephen Gray2by lllaass,★HelpfulWhat monitors?
have you tired making sure each is on a different TB port.
For what TB ports are on which bus see:
Use multiple displays with your Mac Pro (Late 2013) - Apple Support
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Dec 19, 2015 10:01 PM in response to lllaassby Stephen Gray2,Thanks for this Illaass. I did not know about the different bus assigned to the TB ports and this is great and important info. As it was, I did have both monitors on Bus 2. I did switch them to different busses and I still have the same problem. It looks like the monitors are coming up on mirror mode in the extended monitor area. I can see the mouse on both screens. So I still have a problem. My only workaround now is still to boot up with only one monitor connected, then plug in the second monitor. Everything was fine until I updated the OS last night. Thanks again, any other ideas on how to fix this is welcomed.
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Dec 19, 2015 10:39 PM in response to lllaassby Stephen Gray2,The monitors are just 2 cinema HD displays.