Hello,
actually in Options, Multiple Displays, Main display there is only one item "\\.\\DISPLAY1".
Physically both displays are exactly of the same type, both connected via displayport.
I tested it a bit more and it seems it is working properly on MAIN displays only. If window of ProgDVB is on main ...

Hello,
I have laptop in docking station where 2 displays via displayports are connected. Windows 10, Radeon WX 4150 graphic card, latest display drivers.
There is problem with ProgDVB app, it is not possible to put it into fullscreen - then there is just black screen, no sound - it stops playing and ...