Repeating terrain crash

Hi

Dont know whether anybody else is experiencing this problem..... I have aded the addition to the engine, to stop terrain repeating itself with the example code provided here. I noticed that sometimes if the cursor is inactive within the main window for more than a few minutes, i.e. u dont move the mouse, that the pc completely freezes and i have to reboot I took the terrain addition out and it never did this.

I have gone over the code to make sure i have entered it as correct - and i have and found no errors?

Anyone else getting this problem>???

Steve