yeah, this is well known old bug, i don't remember if it was fixed in patch but i had this bug too, screen was blurred from last auto save of poison to first auto save of heat, then bug disappears
old threads reporting same problem (still not solved):
http://forum.1cpublishing.eu/showthread.php?t=7526
http://forum.1cpublishing.eu/showthread.php?p=138314