Sharp Monitor K321H Multistream problem

The Operational Manual instruct to put the monitor in Multiscreen (MST) to get 60Hz, 3840x2160 resolution. So, I did and it seemed to be OK. However after a restart (the next time I started the MacPro (New) the screen appeard stretched horizontal and then the login screen came without the login window. I could start by entering the password but then the desktop is empty.
In the manual it says that images may not be displayed properly with some video card combinations.
My cards are two AMD FirePro D500.
I cant find a solution for this. Could it be in the System update (10.9.3) we are waiting for from Apple?
Jan

The Apple Store also claims it works but it does not. As soon as you switch the display to Multistrem (MST) it restarts. After that you will have an empty finder and no dock. After restarting the MacPro you get a horizotal stretched screen withe the apple symbol. The next screen is the login screen which does not show the login window etc.
Working with 30hz creates problems reading mail etc.
When you buy this screen the userguide does not instruct you to switch to 60hz. I tested the display with TombRaider. That game has a testoption. It showed an average of 27Hz. After that I went searching and found how to set the display to 60hz.
I think its very well possible that other users even don't know they are limited to 30Hz.
Thx for your reply!

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    Neil

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