I'm glad you're not having problems anymore. Be aware however, your video card has a processor too (GPU stands for Graphics Processing Unit) which can overheat just like a CPU, and when it does, it can cause ALL KINDS of issues like the one in those screenshots. I must admit that I personally have never seen a video card "flip out" quite like that, but given the fact that the problem seemed to stem from adding autogen to your scenery, which makes your video card work much harder, heat seemed to be the logical cause. Again, maybe it's a moot point, but it may be something to look into if the problem resurfaces.