Prolly some sort of minidump. I remember something like this happening to me a few versions back. Haven't seen it since the release of the DLC though...

When you want to search for something, I think you get this when you push the button where you see a terran planet and a magnifier (upper left corner), and its an ingame thing. I guess it can useful when you want to search for something (though I never used it because I already know the place of my everything in my empire ), maybe would be the best to find unbuilt extractor places, but if you just check all your planets that is almost as good, and you surely will check upon your planets to see what they are doin/aren't doing anyway.