Well, I have a PC that has a GPU from 2009, and now I have some problems with a fork.
The project was on Unity 5 (2015) and I have upgraded it to Unity 2018.1.0, without any problems.
But some times, when I updated scripts or changed something in the scene the problem appeared.
Is a rendering problem that only occurs in DirectX 10 (my GPU is a GeForce 9600 that supports up to DX 9.0c, so I don't underatand how this is capable of running DX 10). Because, if I run with
-force-opengl all runs fine.
I can go back, but the problem is in the Library folder, because if I use "Assets > Reimport all" or I remove this folder, the problem dissapeared (before, not now).
This is the problem:
Researching I have worsened it:
As you can see, sometimes the problem is blue and purple, and other times is completely black.
The last problem remembers me to: https://forum.unity.com/threads/black-textures-on-some-devices-android-versions.195328/
I have builded the project and there isn't any problem, so the problem is somewhere in the Editor or with a UNITY_EDITOR preprocessor directive.
I don't know what I have to do to fix this. Is like this is very random.