Problem with standard shaders, pink artifacts on objects, how to solve?

Question

Shaders

Good day, the Unity3D 5.5 update has finally been released, so I updated it, but the problem showed up by itself and immediately! Everything on the project was covered in pink artifacts...
In the previous version of Unity3D, this was not the case...
The problem is that the Source that uses the shader is connected directly to the sky! (SkyBox) After deleting the
sky, everything disappeared... But without the sky, the game is not a game :)
I tried to clean the GICache (Global Illumination Cache, surprisingly 9 GB of garbage accumulated which cleaned my computer great)) But constantly after the removal is completed, an error pops up saying that may delete some files! When manually deleting everything disappeared, but Unity3D reloads the GICache with artifacts again!
Example in a project:

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Solved the problem with objects! But there is a problem with the map (Terrain) I'm waiting for some more solutions)
Thank you in advance :)

Answer 1

Perhaps there is an answer here.

Answer 2

Is there a solution how to deal with Terrain?