hi, in nehe oop code (opengl.cpp) in initGL function if i change glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background to glClearColor(1.0f, 0.0f, 0.0f, 0.5f); // Black Background background is red in window mode but in fullscreen mode background is displayed black,, why? is this a common problem or just happens in my computer?