Greetings!
At first I didn’t want to create this thread, hoping to resolve it myself. But it turned out to be quite complicated.
After updating my project from Unity 5.1.1 to 5.2.2 something strange happened with the terrain. It became pink, as if without any shaders. After changing the “Base Map Dis.” parameter to 0, some abstract green mess is viewed.
So I may paint textures and see how color changes, meaning that they are applied to it, but without proper details.
I tried to reimport the terrain, create new one inside the existing project (nothing), reimport the “built-in-shaders” folder, change the material type in terrain settings menu (builtin standart/legacy diffuse…)
Everything seems to be normal… and it doesn’t work. Of course, if I create a new project from scratch it’s ok there. Still it’s not the solution.