Looks like there's another bug with the floor tile graphics, again found in the random facilities you encounter in 'Explore' missions. Recently, I've noticed that when (or soon after), I fire a weapon some of the floor tiles in the gray/white facilities flicker to black/very dark. If it matters I currently use the 'Rapid-Fire Polaron Assault Mk VII' special mission reward and a purple Polaron Split-Beam Mk VIII.
It seems to be somewhat random, as it doesn't always occur, and sometimes happens even when I'm not firing (99% of times in combat though). I've attached a screenshot below demonstrating what I mean, perhaps a dev could pass this along (I could file a bug report in-game, but it's pretty useless without a picture showing exactly what goes on).
EDIT: Seems like this is either more widespread than I first thought, or it's a screw up with my graphics card and has nothing to do with a bug! I observed and screengrabbed the same thing happening on another ground mission (another auto-generated 'fill-in-the-alien' affair). I also noticed that my BOs weapons also cause the effect to manfest. I haven't seen this weirdness before today, but that doesn't eliminate trouble on my end completely. Any ideas on what's going on here?