Bug or problem i could do with some help to sort out- dcs runs on incorrect monitor

[snak]

I have 3 monitors the centre monitor is the one I use to fly DCS  windows has labelled this monitor 1, Nvidia has labeled my main monitor at  number1. In the dcs set up screen i have the monitor to use as 1

If i run dcs in Full screen mode DCS  runs in Monitor 1 

If i uncheck full screen mode DCS runs on the right side monitor even though this is set to monitor 1

Prior to the weekend it was running on monitor regardless of whether i have the full screen mode box checked or not 

I have not changed anything .

I think it could be something to do with thursdays update. Can anyone assist

 

Paul