8-)
I've been testing different settings using Vista and FSX and it seems that when you click on the DirectX 10 preview selection (on FSX settings menu)
you disable all the add-on textures using the bmp format. The aircrafts show-up on your screen without the textures. Reversing the process caused
an unpleasant graphics problem, the image buffer just can't clear the last pixels causing a blurr. I have installed FSX Acceleration, therefore it's possible some of the problems I had may not occur without it and I imagine under Windows XP this should not be a problem since it only works with DirectX 9. If this happens to You I suggest a fresh new installation and forget about that DirectX 10 preview button if you want to
use add-on aircrafts. Since this is basicly new technology I suggest..patience! Happy New Year ALL!