Very faint white box towards the top of the screen

I have a very faint, broken white box towards the top of my screen. One pixel wide white lines. It goes away if I switch from the main map to some of the other screens but always comes back. Restarting the game doesn't help. Starting a new map doesn't help.

 

http://steamcommunity.com/sharedfiles/filedetails/?id=443696353

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