(Ctrl + Shift + . ) doesn't seem to recompile my shader

Development Rendering
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1

I am trying to make some changes to .usf files, mainly for tinkering and learning purposes.
However, when using Ctrl+Shift+. to recompile shaders, its not displaying any changes made.
I have also tried to relaunch the editor, just to be sure. Also tried re-building UE4 solution in Visual Studio.

Specifically, I am tinkering with VisualizeShadingModel Postprocess shader.
And as a first test, I am just outputting a fixed color value.

Is there some setting or arguments I need to use to be able to use this feature.
The Recompiling shader window always pops up when I press the hotkey.

2

This question is resolved, as the hotkey actually works as expected.
Confirmed it by testing on another shader, so the issue seem to be with VisualizeShadingModel shader in particular.