Alt+Tab pushes graphics to left hand monitor - unrecoverable

[klem]

I am running three screens in Surround with a fourth below for lower cockpit view. GPU is EVGA GTX980 SC and resolution is 5040x2100. I have MonitorSetup set to have Center viewport as 5040 (3 at 1650) x 1050 plus Bottom viewport picking up middle part of the lower screen as 1680x1050. Actually, overall it is 5140 wide to allow for bezel correction.

 

All runs fine n DCS. However if I Alt+Tab to desktop or other application the entire 5040x2100 shifts to the left hand monitor and can't be recovered. I have to use Task Manager to close it and start again.

 

I have other sims (CoD, FSX) where this does not happen.

 

 

Any ideas how to fix this in DCSW guys?