Ok. yes, i do have some ideas..
This is all going to be on which monitor your set as default..
and those keys to unlocking the issue are going to be in those boxes. 1 , 2 , 3
instead of moving the icons around.
You will need to click on the icons, and then click set as default..
And I should have asked before.. Have you installed your own graphics cards, to allow three monitors?
if not, you will need a card like this, that supports up to three displays.. http://www.amazon.com/dp/B0033WSDO2/?tag=codinghorror-20
There are many cards out there, so depending on the connector types of your monitors, you may or may not need a different card..
Let me know what you have, and if you have a card made for three displays, or if you have a dual card situation..