Menu layer not focused, cursor in background

Hi,
Just installed ReShade 3.0.8 for Unreal Tournament, a game from 1999. Both OpenGL and Direct3D (9) have the same problem (that game still allowed you to freely switch the API from a range of choices!!). When I open the menu with Shift + F2, the mouse cursor shown for the menu is stuck. When I move my mouse, the other cursor of the game moves. As if there's no focus on the menu.