Thanks for the fast reply. On my machine it works in debug mode, as an executable, and in windowed or full screen mode. It also works full screen or windowed on every resolution my monitor can do. I'll have my sibling check their DirectX and OpenGL versions and ask what their monitor resolution is too. I think their computer might be older so that might be the issue. Is there a version of DirectX that you think would indicate it is too old for it to work?