The problem is Unigine don't know how to use GLSL, again.

There is "#extension GL_ARB_sample_shading : enable" in the middle of (all?)
shaders. This is not allowed by any GLSL specification. All #extension
directives must occur before any non-preprocessor tokens, which pretty much
means "at the beginning of shader code".

What I see: Valley is loading. Then there is hang and it recovers successfully.
After that, Valley seems to have exited. That's all.