So after upgrading to 2018.3 My game no longer works. At first my player character was floating about 60 meters higher than they should be. It took me a while to figure out it had something to do with the collider. For some reason the terrain collider is reporting something wrong. So then I look at the terrain and I see this: I have tried everything I could think of but the message never goes away. Do I need to upgrade this terrain using some tool or something? What am I missing? Update: I see that it doesn't like multiple inspector windows. But still have a problem with the terrain collider. Update 2: So I tried creating a new terrain and that works but using my existing terrain does not. Any way to import the old terrain into a new one?