I get strange LOD bugs with buildings as well in the newest dev build. I can be around 100m from a building, and it will randomly flicker from a high LOD model to a low one, and back again. There must have been an update overnight, because I played with some friends last night and it was fine.

Upvoted. I tried to play stealthfully the other day (using a silenced M14 EBR and a silenced pistol) And before I could even get close, no matter how much I would crawl or slow walk, they would always see me when I got within 100m or so, even when using tall grass, bushes, trees, even houses. I really hope the AI gets touched up before final release, because it can be rather frustrating at times. I messed with the sill slider as well, and from what I saw, it did change their reaction time, but they were still able to pinpoint where I was immediately every time.