Ive been having some really bad terrain pop ins lately, it's really noticeable on cliff sides, and even forts and towers sometimes do it. They look really low res and then when i get closer they change to high res. And when i say closer i dont mean like 500 feet, im talking about 50 feet infront of me. Ive been looking around and ive found some people with almost the same problem but no one had a solution. Here's a picture i found of someone with the same issue
http://cloud.steampowered.com/ugc/632983753148614698/06553228569D3F92A66E730AAE09681DFCF85BE9/