I am getting the same problem on Arena 6.1.3 on Windows 10 with a AMD WX9100 graphics card using 4 identical Epson projectors (EB-G7900U). 
This issue happens every time I restart the server or projectors. 
Using madmapper I get exactly the same behavior which leads me to think its something to do ...
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- Tue Apr 02, 2019 13:03
 - Forum: Problems? Bugs? Solutions!
 - Topic: Advanced output display selection different after restarting PC
 - Replies: 13
 - Views: 29038