in the first boot up of game, there were some issues with sound and rendering. then i added launch options. sound problem fixed. but it was crashing at the start of each mission. Put the graphics to "Auto-Setting". Crash fixed but still, there was issue when i move to other window and come back game screen was becoming black. there is sound but black screen. changed FPS limit from 60 to 95. DONE. all working flawless.