It should be related to brightness, the fog never caused any issues like this to me. Fog is randomly happening and very scattered actually. Just set brightness to 0 for white maps. Some maps are overexposured, so there is nothing you can do about this.Sometimes the fog, makes it unplayable it just appears all white screen, is that suposes to happen? Or is it as you mentioned a brightnes problem, because it accured to me only when fog is presented.
Good to hear that you fixed the problem. It's possible that this is happening because of the checkmark in the launcher. But yeah, you already resolved the issue anyway. Have funI had the same problem in the first mod the same message and the same crash
but i fixed like this