In the graphics settings on runescape, go to custom (logged into the actual game) and you will see "display mode" there will be 3 options in boxes. 1: Software, 2:OpenGL, 3: DirectX, select software and see if this changes anything, if it does not go back to the first graphic option screen and click "RE-RUN AUTO SETUP" that should fix it, it did for me. Hope this helped :)