I'm running Autumn Aurora for Shadow of Chernobyl.
I started a new game but the loading screen got stuck on loading the shaders.

When I backed out into the windows, it turns out there is an error message but,
for some reason, I can't ever read X-Ray engine error messages because the
game itself is always layed over it, making it impossible to tell what exactly went wrong.

I would try reinstalling the mod or even both the game and the mod.
If the problem still occurs, you may want to try (this solution): you have to change the base game graphics settings, choosing "Full Dynamic Lighting" as render.