Ever since Viking Conquest came out, along with its patches every 20-50ish times I return to the world map from somewhere else, the sky is pitch black. It does this across different mods, and only started in my current Floris campaign when the aforementioned patches hit, and the campaign was around day 50 by then, and had had no problems up until that point. I can fix it by existing to main menu, and reloading the save, but it's a less than ideal solution to reload my game every 10 minutes.