https://drive.google.com/file/d/0B4Y8_8iooOzeOE4yMFYxT0lvQ0k/edit?usp=sharing
I've been getting these white tiles appearing randomly during my games - seemed to start on desert maps, and they got larger and larger - the corvette ufo turned white as well when I used my C4 on it.
Restarting the game seems to have fixed the issue, and i neglected to grab screenshots beforehand. This may not be reproducable, sorry.