Well that's a new one on me, I have seen similar when using slew mode, where it takes ages for the computer to render. It may be hardware related such as the processor not running at full tilt or as you have re-installed Windows it may still be updating or been taken over by a host process doing something. Have a look at Task Manager to see what your processor is up to, and are all the drivers up to date.
What gets me is that the ground textures look OK and the trees on the hillside look fine, I hate to ask but are the ORBX library files up to date.
Cheers
Rich still thinking
