I have a problem with my night sky where there is a white streak that looks like someone took a giant paintbrush and brushed it across the screen. I cannot figure out what happened with it. I have ultimate terrain x, ground environment x, and flight environment x and have tried different things, but can't seem to figure out what caused it. I have nvidia 8800GTX and use Nhancer. I'll try to post a screen shot. It only shows up at night in the eastern sky and seems to "follow me around."

It's supposed to be the Milky Way galaxy.

Go to a place with no light pollution on a moonless night and you should be able to see it. I am talking about in reality, not in the sim.