Light shafts

[fvd]

Hi,

Am i the only one who has some grapical problems with the option "light shafts"?
If this option is checked i get these really strange effects at the sky at night (during the day everything looks normal)
I have a new pc 'dual core 2.66, 2gb DDR4, NVIDIA GeForce 8800 GTS (320 MB) and running XP service pack2

Drivers for the Geforce are the latest ones.

Except for this problem (it looks like strange light reflections at the sky during the night) i also see some strange effects at night, it's hard to describe (no, it isn't visible in any screenshot strangely enough) but it looks like i am running the game with a very poor and old graphics card, all the gradients between colors are very poor.
The gradients are really visible in some different steps, instead of that they are nice and fluid. (like i said, hard to explain)

This second problem is also there if i uncheck the "light shafts" option.
I took some digital photo's because the problems don't show on any screenshot, i'll post them tomorrow.

Thanks aleady! (it's driving me nuts )
fvd