I have narrowed it down to the last week in December. Jan 1 it goes back to normal. I have also tried a combo of cycling on and off Us Cities x Chicago and Orbx open lc. Doesn't seem to make a difference. I do have the latest download version as you mentioned. I also noticed that at night during tha...

Sorry this took so long to get. Here is a top view. Interesting thing also is during this hard winter period sometimes the AI traffic is gone, sometimes its there.

Just Curious if this is how the ground at the airport was intended to look during hard winter in FSX? I am doubtful because of how the white meshes with the scenery surrounding the airport. Screenshot attached. Thx!