Mouse cursor not disappearing

Hi,I'm having a problem with FSX. As we all know, the mouse pointer/cursor always disappears after a few seconds after we haven't moved it anymore. When I start a flight in the NGX, it's all fine. The mouse cursor normally disappears after a few seconds. But a few minutes it doesn't disappear anymore, it just stays there. I'm also using the REX 2.0 Weather Engine en Weather Avoidance System running in the background. I tthink that that is the problem. Is there anyway how I can make the mouse pointer always disappear normally after a few seconds? I don't like having that white thing in the middle of the screen all the time while flying.Thanks!