I think that this was the issue. I was not running the most recent version of Slayer, and that must have caused all this.
I'm pretty sure this is Farlands Extreme, because I had the same effects when I downloaded Farlands Extreme...
Meh
I did not have that enabled.
Entering new Sky(); into the console should fix this temporarily. It will just be a white sky, but it eliminates this problem. I'll give you the full code for making a new sky in like 10 minutes as I don't have access to a computer right now.