FleetCommand, try disabling shaders
Not long ago I passed through that part (Selphie with two characters incursion at Missile Base). That kind of glitch is very common in places like that, and… Tomb of the Unknown King. But disabling shaders doesn’t any difference (at least on my PC). I have the same glitch, and I have shaders not activated, practically since the beginning, and it’s still there.
Hey man (
FleetCommand), did you already notice that you can make disappear all that mess, just opening and closing the MENU?
Although… I remember have read, weeks ago, a thread of someone who had the same glitch, but his example was the Tomb of the Unknown King (I remember the screencapture). Those glitches aren’t permanent, and that’s because I just continued the game. You could check that out, maybe he got a solution there.