About the Windowed mode problem, I think I will by the way set FullscreenMode=0 and wait Epic fixes the problem. If I am correct, I must write FullscreenMode=0 in the GameUserSettings.ini (which is blank) located in …/Intermediate/Config/CoalescedSourceConfigs ? Since UE4 detects the resolution of the screen, why not set a project in FullscreenMode=0 ?