Even though the game is set to run full screen it always plays the intro in a window.

Very weird.

Heya - It has to do with the way we detect your default resolution. We'll certainly look for a better solution, but this is a legacy implementation from our old engineer, so that may take some time.

WINAPI GetSystemMetrtics ?

https://msdn.microsoft.com/en-us/library/ms724385%28v=vs.85%29.aspx

or

FVector2D GetGameViewportSize()
{
FVector2D Result = FVector2D( 1, 1 );

if ( GEngine && GEngine->GameViewport )
{
GEngine->GameViewport->GetViewportSize( /*out*/Result );
}

return Result;
}

FVector2D GetGameResolution()
{
FVector2D Result = FVector2D( 1, 1 );

Result.X = GSystemResolution.ResX;
Result.Y = GSystemResolution.ResY;

return Result;
}

this is my problem too. I use standard 1920 x 1080 resolutoin set at various refresh rates, have tried 144, 120, and half adaptive settings with the card's drivers.. I use a DVI-I Geforce GTX 780 Ti card and a Asus V6278HE monitor set at defaults. nVidia drivers 364.51. no change still in window, not full screen.

Another option, that some games take is to go with a low default (like 800x600, 1024x768, etc) and just let the user set it on first launch.

I've never seen a game not play it's intro movie full screen before - it's weird.