How can I create top down mouse-driven aiming? (Crosshair follows cursor, fires projectiles at cursor location)

Its possible you didn’t set the UWidth & VHeight properly. Setting it to a high number will result in a color of the texture itself. Repeating it so much, its most prominent color is only shown. Setting this to 1, will tell the Texture to draw once within the UV Space. Thus showing the texture in its full clarity.