SU11 and multi-screen setup seems broken

My triple screen setup has been stable for a couple of weeks now, however, after today updating to SU11 I see that when ending a flight and returning to the main screen it moves one side panel of the triple to be underneath the other side panel so it appears missing.

It never did this before so i presume its an SU11 bug - anyone else getting it?

Nobody else got this?

Bug report here…
https://forums.flightsimulator.com/t/su11-and-multi-render-windows-no-longer-works-correctly/556116

It also starts up every time with the windows setup wrong, any ideas?