So to test it out, I selected the three monitor layout in DCS. THe only thing that happened was, that my main monitor hat one window with DCS, but it was vertical, so I could open the settings and change it back but not apply it. Then, after restarting the window was completely gone. Every time the window with DCS is selected, my mouse bugs in the bottom right corner and keeps jiggling around there. I reinstalled it and all that stuff. Is there anyone able to help me out here?