I have no answer for this. My texture filepaths are short and my folders are clean. The only difference between the maps you mentioned and mine is that Ray County has far more dense foliage and trees than those maps. That is really the only difference that I can come up with and it is one that I'm not willing to compromise on because I think it is one of the most important and immersive aspects of a map. I will sacrifice framerate all day to have a realistic looking environment, but maybe that is just me.