Also this has since stopped happening (I have no clue why) but for the first few days of me playing 8.1 my screen would randomly flash green and white, not as in the whole screen flashed, but all the shadows would become bright green for a half second. Its gone now but while it was happening it gave me a serious headache.
(Third and final thing I remembered which has almost certianly been said by someone else on this thread ((but I dont wanna check cause spoilers :3) but maxwell, and none of the other cats, will randomly aquire a status of some kind when loading the game or bringing him back into the render distance, like sometimes he will freeze which isnt so bad since he goes right back, but sometimes hell become rotten instantly, or start smoking/burning to a crisp. Is maxwell supposed to be this chaotic and unpredictable?))