Salvo, did you modify the shaders? You should really know that are you doing in shader code. Also, modifying the shaders is not a good idea, SE is not designed to it.
because any changes into a shader make SE crash...
Variable tweaking in shaders doesn't cause crashes, unless you completely change its function. You can also swap some shader functions for others and those kinds of edits work fine.
Intel Core i7-5820K 4.2GHz 6-Core Processor G.Skill Ripjaws V Series 32GB (4 x 8GB) DDR4-2400 Memory EVGA GTX 980 Ti SC 6GB
Procedural texture generator shader does not affect reflection. Water is rendered by one of the shaders located in the cache: cache/shaders/glsl/*water*.glsl