I'm having an issue in Skyrim where the sun will regularly disappear from the game. When I open the file the sun appears with the sunglare as normal, but when I fast travel, move to a different location, rest, or even open the map up I find that the sun has disappeared, though a slightly faded sunglare remains. I've tried swapping vary textures to see if that helps, though it's the same with each one. Has anyone else ever encountered this problem?

Yes, same problem here. The only solution I found was to save and reload.